fix: more fixes

crates/pumpkin-data/src/block_state.rs

@@ -126,6 +126,24 @@ impl BlockState {
         self.state_flags & HAS_RANDOM_TICKS != 0
     }
 
+    /// Returns whether this block state is a full opaque cube (`isSolidRender()` in Java).
+    #[must_use]
+    pub const fn is_solid_render(&self) -> bool {
+        self.state_flags & IS_SOLID_RENDER != 0
+    }
+
+    /// Returns whether this block state can occlude other blocks (`canOcclude` in Java).
+    #[must_use]
+    pub const fn can_occlude(&self) -> bool {
+        self.state_flags & CAN_OCCLUDE != 0
+    }
+
+    /// Returns whether this block produces an analog output signal for comparators (`hasAnalogOutputSignal()` in Java).
+    #[must_use]
+    pub const fn has_analog_output_signal(&self) -> bool {
+        self.state_flags & HAS_ANALOG_OUTPUT_SIGNAL != 0
+    }
+
     ///`isFaceSturdy()` in Java!
     #[must_use]
     pub const fn is_side_solid(&self, side: BlockDirection) -> bool {
@@ -275,6 +293,24 @@ impl BlockStateId {
         Block::from_state_id(self)
     }
 
+    #[inline]
+    #[must_use]
+    pub const fn is_solid_render(self) -> bool {
+        self.to_state().is_solid_render()
+    }
+
+    #[inline]
+    #[must_use]
+    pub const fn can_occlude(self) -> bool {
+        self.to_state().can_occlude()
+    }
+
+    #[inline]
+    #[must_use]
+    pub const fn has_analog_output_signal(self) -> bool {
+        self.to_state().has_analog_output_signal()
+    }
+
     #[inline]
     #[must_use]
     pub fn is_waterlogged(self) -> bool {
@@ -324,6 +360,9 @@ const IS_SOLID: u16 = 1 << 6;
 const IS_FULL_CUBE: u16 = 1 << 7;
 const IS_SOLID_BLOCK: u16 = 1 << 8;
 const HAS_RANDOM_TICKS: u16 = 1 << 9;
+const IS_SOLID_RENDER: u16 = 1 << 10;
+const CAN_OCCLUDE: u16 = 1 << 11;
+const HAS_ANALOG_OUTPUT_SIGNAL: u16 = 1 << 12;
 
 // side_flags
 const DOWN_SIDE_SOLID: u8 = 1 << 0;

crates/pumpkin-world/src/generation/feature/features/monster_room.rs

@@ -39,7 +39,9 @@ impl DungeonFeature {
             for dy in -1..=4i32 {
                 for dz in min_z..=max_z {
                     let check_pos = pos.0.add(&Vector3::new(dx, dy, dz));
-                    let solid = !chunk.is_air(&check_pos);
+                    let solid = GenerationCache::get_block_state(chunk, &check_pos)
+                        .to_state()
+                        .is_solid();
 
                     if dy == -1 && !solid {
                         return false;
@@ -78,11 +80,13 @@ impl DungeonFeature {
 
                     if on_boundary {
                         let below_pos = wall_pos.add(&Vector3::new(0, -1, 0));
-                        let below_solid = !chunk.is_air(&below_pos);
+                        let below_solid = GenerationCache::get_block_state(chunk, &below_pos)
-                        let cur_solid = !chunk.is_air(&wall_pos);
+                            .to_state()
-                        let is_chest = GenerationCache::get_block_state(chunk, &wall_pos)
+                            .is_solid();
-                            .to_block()
+                        let cur_state =
-                            == &Block::CHEST;
+                            GenerationCache::get_block_state(chunk, &wall_pos).to_state();
+                        let cur_solid = cur_state.is_solid();
+                        let is_chest = cur_state.id.to_block() == &Block::CHEST;
 
                         let world_min_y = chunk.bottom_y() as i32;
                         if wall_pos.y >= world_min_y && !below_solid {
@@ -98,9 +102,9 @@ impl DungeonFeature {
                             }
                         }
                     } else {
-                        let state = GenerationCache::get_block_state(chunk, &wall_pos);
+                        let state = GenerationCache::get_block_state(chunk, &wall_pos).to_state();
-                        let is_chest = state.to_block() == &Block::CHEST;
+                        let is_chest = state.id.to_block() == &Block::CHEST;
-                        let is_spawner = state.to_block() == &Block::SPAWNER;
+                        let is_spawner = state.id.to_block() == &Block::SPAWNER;
                         if !is_chest && !is_spawner {
                             chunk.set_block_state(&wall_pos, Block::CAVE_AIR.default_state);
                         }
@@ -122,22 +126,20 @@ impl DungeonFeature {
 
                 let wall_count = BlockDirection::horizontal()
                     .iter()
-                    .filter(|d| !chunk.is_air(&chest_pos.add(&d.to_offset())))
+                    .filter(|d| {
+                        GenerationCache::get_block_state(chunk, &chest_pos.add(&d.to_offset()))
+                            .to_state()
+                            .is_solid()
+                    })
                     .count();
 
                 if wall_count == 1 {
-                    let facing_dir = BlockDirection::horizontal()
+                    let chest_state =
-                        .iter()
+                        crate::generation::structure::structures::StructurePiece::reorient(
-                        .find(|d| !chunk.is_air(&chest_pos.add(&d.to_offset())))
+                            &chest_pos,
-                        .copied();
+                            Block::CHEST.default_state,
-
+                            |p| GenerationCache::get_block_state(chunk, p),
-                    let chest_state = facing_dir.map_or(Block::CHEST.default_state, |dir| {
+                        );
-                        use pumpkin_data::block_properties::ChestLikeProperties;
-                        let mut props = ChestLikeProperties::default(&Block::CHEST);
-                        props.facing = dir.opposite();
-                        let state_id = props.to_state_id(&Block::CHEST);
-                        pumpkin_data::BlockState::from_id(state_id)
-                    });
 
                     chunk.set_block_state(&chest_pos, chest_state);
 

crates/pumpkin-world/src/generation/structure/structures/buried_treasure.rs

@@ -122,7 +122,11 @@ impl StructurePieceBase for BuriedTreasurePiece {
                 self.piece.bounding_box = BlockBox::new(pos.x, pos.y, pos.z, pos.x, pos.y, pos.z);
 
                 if chunk_box.contains_pos(&pos) {
-                    chunk.set_block_state(pos.x, pos.y, pos.z, Block::CHEST.default_state);
+                    let chest_state =
+                        StructurePiece::reorient(&pos, Block::CHEST.default_state, |p| {
+                            chunk.get_block_state(p)
+                        });
+                    chunk.set_block_state(pos.x, pos.y, pos.z, chest_state);
 
                     let mut nbt = NbtCompound::new();
                     nbt.put_string("id", "minecraft:chest".to_string());

crates/pumpkin-world/src/generation/structure/structures/desert_pyramid.rs

@@ -196,26 +196,23 @@ impl DesertPyramidPiece {
         }
 
         let world_pos = self.piece.offset_pos(x, y, z);
-        if !bb.contains_pos(&world_pos) {
+        let mut random = RandomGenerator::Legacy(LegacyRand::from_seed(hash_block_pos(
-            return;
+            world_pos.x,
+            world_pos.y,
+            world_pos.z,
+        ) as u64));
+
+        if self.piece.add_chest(
+            chunk,
+            bb,
+            &mut random,
+            x,
+            y,
+            z,
+            "minecraft:chests/desert_pyramid",
+        ) {
+            self.has_placed_chest[index] = true;
         }
-
-        self.piece
-            .add_block(chunk, Block::CHEST.default_state, x, y, z, bb);
-
-        let mut nbt = NbtCompound::new();
-        nbt.put_int("x", world_pos.x);
-        nbt.put_int("y", world_pos.y);
-        nbt.put_int("z", world_pos.z);
-        nbt.put_string("id", "minecraft:chest".to_string());
-        nbt.put_string("LootTable", "minecraft:chests/desert_pyramid".to_string());
-
-        let mut random =
-            LegacyRand::from_seed(hash_block_pos(world_pos.x, world_pos.y, world_pos.z) as u64);
-        nbt.put_long("LootTableSeed", random.next_i64());
-
-        chunk.add_block_entity(nbt);
-        self.has_placed_chest[index] = true;
     }
 
     fn add_cellar(&self, chunk: &mut ProtoChunk, bb: &BlockBox, random: &mut RandomGenerator) {

crates/pumpkin-world/src/generation/structure/structures/mod.rs

@@ -1,7 +1,6 @@
 use std::sync::{Arc, Mutex};
 
-use pumpkin_data::Block;
+use pumpkin_data::{Block, BlockId, BlockState};
-use pumpkin_data::BlockState;
 use pumpkin_data::{Mirror, Rotation};
 use pumpkin_util::HeightMap;
 use pumpkin_util::{
@@ -464,6 +463,89 @@ impl StructurePiece {
         // }
     }
 
+    /// Reorients a chest block state based on solid render neighbors, matching vanilla `StructurePiece.reorient`.
+    #[must_use]
+    pub fn reorient(
+        pos: &Vector3<i32>,
+        block_state: &'static BlockState,
+        mut get_block_state: impl FnMut(&Vector3<i32>) -> pumpkin_data::BlockStateId,
+    ) -> &'static BlockState {
+        use pumpkin_data::block_properties::{ChestProperties, HorizontalFacing};
+
+        let mut solid_neighbor: Option<HorizontalFacing> = None;
+
+        let horizontal = [
+            HorizontalFacing::North,
+            HorizontalFacing::South,
+            HorizontalFacing::West,
+            HorizontalFacing::East,
+        ];
+
+        let offset = |facing: HorizontalFacing| match facing {
+            HorizontalFacing::North => Vector3::new(0, 0, -1),
+            HorizontalFacing::South => Vector3::new(0, 0, 1),
+            HorizontalFacing::West => Vector3::new(-1, 0, 0),
+            HorizontalFacing::East => Vector3::new(1, 0, 0),
+        };
+
+        let opposite = |facing: HorizontalFacing| match facing {
+            HorizontalFacing::North => HorizontalFacing::South,
+            HorizontalFacing::South => HorizontalFacing::North,
+            HorizontalFacing::West => HorizontalFacing::East,
+            HorizontalFacing::East => HorizontalFacing::West,
+        };
+
+        let clockwise = |facing: HorizontalFacing| match facing {
+            HorizontalFacing::North => HorizontalFacing::East,
+            HorizontalFacing::East => HorizontalFacing::South,
+            HorizontalFacing::South => HorizontalFacing::West,
+            HorizontalFacing::West => HorizontalFacing::North,
+        };
+
+        for direction in horizontal {
+            let relative_pos = *pos + offset(direction);
+            let state = get_block_state(&relative_pos).to_state();
+            if state.id.to_block_id() == BlockId::CHEST {
+                return block_state;
+            }
+
+            if state.is_solid_render() {
+                if solid_neighbor.is_some() {
+                    solid_neighbor = None;
+                    break;
+                }
+                solid_neighbor = Some(direction);
+            }
+        }
+
+        let mut props = ChestProperties::from_state_id(block_state.id);
+
+        if let Some(solid_dir) = solid_neighbor {
+            props.facing = opposite(solid_dir);
+            return BlockState::from_id(props.to_state_id(&Block::CHEST));
+        }
+
+        let mut lock_dir = props.facing;
+
+        let mut relative_pos = *pos + offset(lock_dir);
+        if get_block_state(&relative_pos).to_state().is_solid_render() {
+            lock_dir = opposite(lock_dir);
+            relative_pos = *pos + offset(lock_dir);
+        }
+
+        if get_block_state(&relative_pos).to_state().is_solid_render() {
+            lock_dir = clockwise(lock_dir);
+            relative_pos = *pos + offset(lock_dir);
+        }
+
+        if get_block_state(&relative_pos).to_state().is_solid_render() {
+            lock_dir = opposite(lock_dir);
+        }
+
+        props.facing = lock_dir;
+        BlockState::from_id(props.to_state_id(&Block::CHEST))
+    }
+
     /// Places a chest with a deferred loot table at the given local coordinates.
     ///
     /// Returns `true` if the chest was placed (i.e., the position is within the bounding box),
@@ -478,6 +560,22 @@ impl StructurePiece {
         y: i32,
         z: i32,
         loot_table: &str,
+    ) -> bool {
+        self.create_chest(chunk, bb, random, x, y, z, loot_table, None)
+    }
+
+    /// Creates and places a chest at the given local coordinates, matching vanilla `StructurePiece.createChest`.
+    #[allow(clippy::too_many_arguments)]
+    pub fn create_chest(
+        &self,
+        chunk: &mut ProtoChunk,
+        bb: &BlockBox,
+        random: &mut RandomGenerator,
+        x: i32,
+        y: i32,
+        z: i32,
+        loot_table: &str,
+        block_state: Option<&'static BlockState>,
     ) -> bool {
         use pumpkin_nbt::compound::NbtCompound;
 
@@ -486,12 +584,17 @@ impl StructurePiece {
             return false;
         }
 
-        chunk.set_block_state(
+        if chunk.get_block_state(&world_pos).to_block_id() == BlockId::CHEST {
-            world_pos.x,
+            return false;
-            world_pos.y,
+        }
-            world_pos.z,
+
-            Block::CHEST.default_state,
+        let state = block_state.unwrap_or_else(|| {
-        );
+            Self::reorient(&world_pos, Block::CHEST.default_state, |p| {
+                chunk.get_block_state(p)
+            })
+        });
+
+        chunk.set_block_state(world_pos.x, world_pos.y, world_pos.z, state);
 
         let mut nbt = NbtCompound::new();
         nbt.put_string("id", "minecraft:chest".to_string());

crates/pumpkin-world/src/generation/structure/template/processor.rs

@@ -471,9 +471,7 @@ impl StructureProcessor {
             }
             Self::LavaSubmergedBlock => {
                 let world_state_id = placer.get_block_state(&world_pos);
-                if world_state_id.to_block_id() == BlockId::LAVA
+                if world_state_id.to_block_id() == BlockId::LAVA && !state.is_solid_render() {
-                    && (!state.is_full_cube() || !state.is_solid_block())
-                {
                     return None;
                 }
                 Some(state)

crates/pumpkin-world/src/lighting/engine.rs

@@ -4,7 +4,7 @@ use crate::generation::height_limit::HeightLimitView;
 use crate::generation::proto_chunk::GenerationCache;
 use crate::lighting::storage::{get_block_light, get_sky_light, set_block_light, set_sky_light};
 use pumpkin_config::lighting::LightingEngineConfig;
-use pumpkin_data::{BlockDirection, BlockStateId};
+use pumpkin_data::{BlockDirection, BlockState, BlockStateId};
 use pumpkin_util::HeightMap;
 use pumpkin_util::math::position::BlockPos;
 use pumpkin_util::math::vector3::Vector3;
@@ -255,6 +255,7 @@ impl<P: LightProvider> LightPropagator<P> {
         self.decrease_queue.clear();
     }
 
+    #[expect(clippy::too_many_lines)]
     pub fn propagate(&mut self, cache: &mut Cache) {
         let cache_x = cache.x;
         let cache_z = cache.z;
@@ -319,7 +320,12 @@ impl<P: LightProvider> LightPropagator<P> {
                         let op = if state_id == BlockStateId::AIR {
                             0
                         } else {
-                            state_id.to_state().opacity
+                            let s = state_id.to_state();
+                            if s.can_occlude() {
+                                s.opacity.max(1)
+                            } else {
+                                s.opacity
+                            }
                         };
                         let light = P::get_light_proto(c, section_idx, local_x, local_y, local_z);
                         (op, light)
@@ -332,7 +338,12 @@ impl<P: LightProvider> LightPropagator<P> {
                         let op = if state_id == BlockStateId::AIR {
                             0
                         } else {
-                            state_id.to_state().opacity
+                            let s = state_id.to_state();
+                            if s.can_occlude() {
+                                s.opacity.max(1)
+                            } else {
+                                s.opacity
+                            }
                         };
                         (op, P::get_light(cache, neighbor_pos))
                     }
@@ -390,8 +401,12 @@ impl<P: LightProvider> LightPropagator<P> {
                     continue;
                 }
 
-                let state = cache.get_block_state(&neighbor_pos.0);
+                let state = cache.get_block_state(&neighbor_pos.0).to_state();
-                let opacity = state.to_state().opacity;
+                let opacity = if state.can_occlude() {
+                    state.opacity.max(1)
+                } else {
+                    state.opacity
+                };
 
                 let predicted = P::propagate_level(old_val, opacity, dir);
 
@@ -600,7 +615,12 @@ impl SkyLightPropagator {
                             let opacity = if state_id == BlockStateId::AIR {
                                 0
                             } else {
-                                state_id.to_state().opacity as i32
+                                let s = state_id.to_state();
+                                if s.can_occlude() {
+                                    s.opacity.max(1) as i32
+                                } else {
+                                    s.opacity as i32
+                                }
                             };
 
                             light = light.saturating_sub(opacity);
@@ -645,7 +665,12 @@ impl SkyLightPropagator {
                             let opacity = if state_id == BlockStateId::AIR {
                                 0
                             } else {
-                                state_id.to_state().opacity as i32
+                                let s = state_id.to_state();
+                                if s.can_occlude() {
+                                    s.opacity.max(1) as i32
+                                } else {
+                                    s.opacity as i32
+                                }
                             };
 
                             light = light.saturating_sub(opacity);
@@ -811,6 +836,53 @@ impl LightEngine {
             self.sky_light.visited.clear();
         }
     }
+
+    /// Checks if a block state has an empty shape for light occlusion, matching vanilla `LightEngine.isEmptyShape`.
+    #[inline]
+    #[must_use]
+    pub const fn is_empty_shape(state: &BlockState) -> bool {
+        !state.can_occlude()
+    }
+
+    /// Checks if two block states have different light properties, matching vanilla `LightEngine.hasDifferentLightProperties`.
+    #[inline]
+    #[must_use]
+    pub fn has_different_light_properties(old_state: &BlockState, new_state: &BlockState) -> bool {
+        if std::ptr::eq(old_state, new_state) || old_state.id == new_state.id {
+            return false;
+        }
+
+        old_state.opacity != new_state.opacity
+            || old_state.luminance != new_state.luminance
+            || old_state.can_occlude() != new_state.can_occlude()
+    }
+
+    /// Returns the minimum light dampening for this block state, matching vanilla `LightEngine.getOpacity`.
+    #[inline]
+    #[must_use]
+    pub const fn get_opacity(state: &BlockState) -> u8 {
+        if state.opacity > 1 { state.opacity } else { 1 }
+    }
+
+    /// Calculates the light dampening between two blocks, matching vanilla `LightEngine.getLightDampeningInto`.
+    #[inline]
+    #[must_use]
+    pub const fn get_light_dampening_into(
+        from_state: &BlockState,
+        to_state: &BlockState,
+        _direction: BlockDirection,
+        simple_opacity: u8,
+    ) -> u8 {
+        let from_empty = Self::is_empty_shape(from_state);
+        let to_empty = Self::is_empty_shape(to_state);
+        if from_empty && to_empty {
+            return simple_opacity;
+        }
+        if to_state.can_occlude() && to_state.is_solid_render() {
+            return 16;
+        }
+        simple_opacity
+    }
 }
 
 impl Default for LightEngine {

crates/pumpkin-world/src/lighting/runtime.rs

@@ -41,8 +41,8 @@ impl DynamicLightEngine {
             current_pos.0.y += 1;
 
             let state = level.get_block_state(&current_pos).to_state();
-            if state.opacity > 0 {
+            if state.can_occlude() || state.opacity > 0 {
-                return false; // Hit an opaque block before reaching sky
+                return false; // Hit an opaque or occluding block before reaching sky
             }
         }
 
@@ -289,10 +289,18 @@ impl DynamicLightEngine {
 
             let neighbor_light = self.get_sky_light_level(level, &neighbor_pos);
             let neighbor_state = level.get_block_state(&neighbor_pos).to_state();
-            let opacity = neighbor_state.opacity;
+            let opacity = if neighbor_state.can_occlude() {
+                neighbor_state.opacity.max(1)
+            } else {
+                neighbor_state.opacity
+            };
 
             // Calculate new light level for neighbor
-            let new_light = if light_level == 15 && dir == BlockDirection::Down && opacity == 0 {
+            let new_light = if light_level == 15
+                && dir == BlockDirection::Down
+                && opacity == 0
+                && !neighbor_state.can_occlude()
+            {
                 // Special case: Sky light at 15 propagates down as 15 through transparent blocks
                 15
             } else {
@@ -329,10 +337,18 @@ impl DynamicLightEngine {
             }
 
             let neighbor_state = level.get_block_state(&neighbor_pos).to_state();
-            let opacity = neighbor_state.opacity;
+            let opacity = if neighbor_state.can_occlude() {
+                neighbor_state.opacity.max(1)
+            } else {
+                neighbor_state.opacity
+            };
 
             // Calculate what we would have given this neighbor
-            let expected = if removed_light == 15 && dir == BlockDirection::Down && opacity == 0 {
+            let expected = if removed_light == 15
+                && dir == BlockDirection::Down
+                && opacity == 0
+                && !neighbor_state.can_occlude()
+            {
                 15
             } else {
                 removed_light.saturating_sub(1).saturating_sub(opacity)
@@ -365,10 +381,14 @@ impl DynamicLightEngine {
 
         let current_light = self.get_sky_light_level(level, &pos);
         let block_state = level.get_block_state(&pos).to_state();
-        let opacity = block_state.opacity;
+        let opacity = if block_state.can_occlude() {
+            block_state.opacity.max(1)
+        } else {
+            block_state.opacity
+        };
 
         // Calculate expected sky light
-        let expected_light = if opacity == 15 {
+        let expected_light = if opacity == 15 || block_state.is_solid_render() {
             // Fully opaque block = no light
             0
         } else {
@@ -387,8 +407,12 @@ impl DynamicLightEngine {
 
                     let neighbor_light = self.get_sky_light_level(level, &neighbor_pos);
                     // Calculate potential light from this neighbor
-                    let potential = if neighbor_light == 15 && dir == BlockDirection::Up {
+                    let potential = if neighbor_light == 15
-                        // Sky light at 15 from above stays 15
+                        && dir == BlockDirection::Up
+                        && opacity == 0
+                        && !block_state.can_occlude()
+                    {
+                        // Sky light at 15 from above stays 15 through transparent non-occluding blocks
                         15
                     } else {
                         // Normal decay

crates/pumpkin/src/block/blocks/dripstone.rs

@@ -355,10 +355,7 @@ fn can_support_dripstone(support_block: &Block) -> bool {
     if support_block == &Block::POINTED_DRIPSTONE {
         return true;
     }
-    if support_block.default_state.is_full_cube() && support_block.default_state.is_solid_block() {
+    support_block.default_state.is_solid_render()
-        return true;
-    }
-    false
 }
 fn modify_dripstone_thickness_to(
     world: &Arc<World>,

crates/pumpkin/src/block/blocks/grass_block.rs

@@ -1,8 +1,5 @@
-use pumpkin_data::block_properties::{
+use pumpkin_data::block_properties::{DoubleBlockHalf, TallSeagrassLikeProperties};
-    DoubleBlockHalf, GrassBlockLikeProperties, TallSeagrassLikeProperties,
+use pumpkin_data::{Block, BlockId, BlockState, BlockStateId};
-};
-use pumpkin_data::tag::{self, Taggable};
-use pumpkin_data::{Block, BlockDirection, BlockId, BlockState, BlockStateId};
 use pumpkin_util::math::position::BlockPos;
 use pumpkin_util::random::{RandomGenerator, RandomImpl, xoroshiro128::Xoroshiro};
 use pumpkin_world::generation::feature::{
@@ -13,34 +10,53 @@ use pumpkin_world::tick::TickPriority;
 use pumpkin_world::world::BlockFlags;
 use rand::RngExt;
 
-use crate::block::{BlockBehaviour, BlockMetadata, GetStateForNeighborUpdateArgs, OnPlaceArgs};
+use super::spreading_snowy_block::{SnowyBlock, SpreadingSnowyBlock};
+use crate::block::{
+    BlockBehaviour, BlockMetadata, GetStateForNeighborUpdateArgs, OnPlaceArgs, RandomTickArgs,
+};
 
 pub struct GrassBlock;
 
 impl BlockMetadata for GrassBlock {
     fn ids() -> Box<[BlockId]> {
-        [BlockId::GRASS_BLOCK, BlockId::MYCELIUM, BlockId::PODZOL].into()
+        [BlockId::GRASS_BLOCK].into()
     }
 }
 
 impl BlockBehaviour for GrassBlock {
     fn on_place(&self, args: OnPlaceArgs<'_>) -> BlockStateId {
-        let block_above = args.world.get_block(&args.position.up());
+        SnowyBlock::on_place(args.block, args.world, args.position)
-        let mut props = GrassBlockLikeProperties::from_state_id(args.block.default_state.id);
+    }
-        props.snowy = block_above.has_tag(&tag::Block::MINECRAFT_SNOW);
+
-        props.to_state_id(args.block)
+    fn get_state_for_neighbor_update(
+        &self,
+        args: GetStateForNeighborUpdateArgs<'_>,
+    ) -> BlockStateId {
+        SnowyBlock::get_state_for_neighbor_update(&args)
+    }
+
+    fn random_tick(&self, args: RandomTickArgs<'_>) {
+        let state = args.world.get_block_state(args.position);
+        SpreadingSnowyBlock::random_tick(
+            state,
+            args.world,
+            args.position,
+            &Block::DIRT,
+            Block::GRASS_BLOCK.default_state,
+        );
     }
 
     fn is_valid_bonemeal_target(&self, args: crate::block::BonemealArgs<'_>) -> bool {
-        if args.block != &Block::GRASS_BLOCK {
-            return false;
-        }
         let above = args.position.up();
         args.world.is_in_height_limit(above.0.y)
             && args.world.is_loaded(&above)
             && args.world.get_block_state(&above).is_air()
     }
 
+    fn is_bonemeal_success(&self, _args: crate::block::BonemealArgs<'_>) -> bool {
+        true
+    }
+
     fn perform_bonemeal(&self, args: crate::block::BonemealArgs<'_>) {
         const SPREAD_ATTEMPTS: i32 = 128;
         const ATTEMPTS_PER_STEP: i32 = 16;
@@ -120,23 +136,6 @@ impl BlockBehaviour for GrassBlock {
             }
         }
     }
-
-    fn get_state_for_neighbor_update(
-        &self,
-        args: GetStateForNeighborUpdateArgs<'_>,
-    ) -> BlockStateId {
-        if args.direction == BlockDirection::Up {
-            let block_above = args.world.get_block(args.neighbor_position);
-            let mut props = GrassBlockLikeProperties::from_state_id(args.state_id);
-            let should_be_snowy = block_above.has_tag(&tag::Block::MINECRAFT_SNOW);
-            if props.snowy == should_be_snowy {
-                return args.state_id;
-            }
-            props.snowy = should_be_snowy;
-            return props.to_state_id(args.block);
-        }
-        args.state_id
-    }
 }
 
 fn place_tall_grass(world: &std::sync::Arc<crate::world::World>, position: BlockPos) {

crates/pumpkin/src/block/blocks/mod.rs

@@ -105,6 +105,7 @@ pub mod rooted_dirt;
 pub mod snow;
 pub mod soul_sand;
 pub mod sponge;
+pub mod spreading_snowy_block;
 
 // Entities, hazards & misc gameplay blocks
 pub mod anvil;

crates/pumpkin/src/block/blocks/nylium.rs

@@ -1,9 +1,10 @@
 use std::sync::Arc;
 
 use pumpkin_data::tag::Taggable;
-use pumpkin_data::{Block, tag};
+use pumpkin_data::{Block, BlockDirection, BlockState, tag};
 use pumpkin_macros::pumpkin_block_from_tag;
 use pumpkin_util::math::position::BlockPos;
+use pumpkin_world::lighting::LightEngine;
 use pumpkin_world::world::BlockFlags;
 use rand::RngExt;
 
@@ -14,19 +15,34 @@ use crate::world::World;
 pub struct NyliumBlock;
 
 impl NyliumBlock {
-    fn can_be_nylium(world: &World, pos: &BlockPos) -> bool {
+    #[must_use]
+    pub(crate) const fn can_be_nylium_with_above(
+        state: &BlockState,
+        above_state: &BlockState,
+    ) -> bool {
+        let dampening = LightEngine::get_light_dampening_into(
+            state,
+            above_state,
+            BlockDirection::Up,
+            above_state.opacity,
+        );
+        dampening < 15
+    }
+
+    fn can_be_nylium(state: &BlockState, world: &World, pos: &BlockPos) -> bool {
         let above_pos = pos.up();
         if !world.is_loaded(&above_pos) {
             return true;
         }
         let above_state = world.get_block_state(&above_pos);
-        above_state.opacity < 15
+        Self::can_be_nylium_with_above(state, above_state)
     }
 }
 
 impl BlockBehaviour for NyliumBlock {
     fn random_tick(&self, args: RandomTickArgs<'_>) {
-        if !Self::can_be_nylium(args.world, args.position) {
+        let state = args.world.get_block_state(args.position);
+        if !Self::can_be_nylium(state, args.world, args.position) {
             args.world.set_block_state(
                 args.position,
                 Block::NETHERRACK.default_state.id,

crates/pumpkin/src/block/blocks/plant/mushroom_plant.rs

@@ -33,7 +33,7 @@ fn mushroom_tree_height(rng: &mut impl rand::Rng) -> i32 {
 impl MushroomPlantBlock {
     #[must_use]
     pub const fn may_place_on(state: &BlockState) -> bool {
-        state.is_solid() && (state.is_full_cube() || state.is_solid_block())
+        state.is_solid_render()
     }
 
     pub fn can_survive(

crates/pumpkin/src/block/blocks/redstone/comparator.rs

@@ -4,6 +4,7 @@ use crate::block::entities::comparator::ComparatorBlockEntity;
 use pumpkin_data::{
     Block, BlockDirection, BlockState, BlockStateId, HorizontalFacingExt,
     block_properties::{ComparatorLikeProperties, HorizontalFacing, ModeComparator},
+    sound::{Sound, SoundCategory},
 };
 use pumpkin_macros::pumpkin_block;
 use pumpkin_util::math::{boundingbox::BoundingBox, position::BlockPos};
@@ -31,9 +32,44 @@ impl BlockBehaviour for ComparatorBlock {
     }
 
     fn normal_use(&self, args: NormalUseArgs<'_>) -> BlockActionResult {
+        if !args.player.may_build() {
+            return BlockActionResult::Pass;
+        }
+
         let state = args.world.get_block_state(args.position);
-        let props = ComparatorLikeProperties::from_state_id(state.id);
+        let mut props = ComparatorLikeProperties::from_state_id(state.id);
-        self.on_use(props, args.world, *args.position, args.block);
+
+        props.mode = match props.mode {
+            ModeComparator::Compare => ModeComparator::Subtract,
+            ModeComparator::Subtract => ModeComparator::Compare,
+        };
+
+        let pitch = match props.mode {
+            ModeComparator::Subtract => 0.55,
+            ModeComparator::Compare => 0.5,
+        };
+
+        args.world.play_sound_raw_expect(
+            args.player,
+            Sound::BlockComparatorClick as u16,
+            SoundCategory::Blocks,
+            &args.position.to_centered_f64(),
+            0.3,
+            pitch,
+        );
+
+        let state_id = props.to_state_id(args.block);
+        args.world
+            .set_block_state(args.position, state_id, BlockFlags::NOTIFY_LISTENERS);
+
+        if args.world.get_block(args.position) == args.block {
+            self.update(
+                args.world,
+                *args.position,
+                BlockState::from_id(state_id),
+                args.block,
+            );
+        }
 
         BlockActionResult::Success
     }
@@ -98,7 +134,7 @@ impl BlockBehaviour for ComparatorBlock {
 
     fn on_scheduled_tick(&self, args: OnScheduledTickArgs<'_>) {
         let (block, state) = args.world.get_block_and_state(args.position);
-        Self.update(args.world, *args.position, state, block);
+        self.update(args.world, *args.position, state, block);
     }
 
     fn on_state_replaced(&self, args: OnStateReplacedArgs<'_>) {
@@ -138,7 +174,7 @@ impl RedstoneGateBlock<ComparatorLikeProperties> for ComparatorBlock {
         let j = RedstoneGateBlock::get_output_level(self, world, pos);
         let props = ComparatorLikeProperties::from_state_id(state.id);
 
-        if i != j || props.powered != RedstoneGateBlock::has_power(self, world, pos, state, block) {
+        if i != j || props.powered != self.has_power(world, pos, state, block) {
             let priority =
                 if RedstoneGateBlock::is_target_not_aligned(self, world, pos, state, block) {
                     TickPriority::High
@@ -156,7 +192,7 @@ impl RedstoneGateBlock<ComparatorLikeProperties> for ComparatorBlock {
     }
 
     fn has_power(&self, world: &World, pos: BlockPos, state: &BlockState, block: &Block) -> bool {
-        let i = RedstoneGateBlock::get_power(self, world, pos, state, block);
+        let i = self.get_power(world, pos, state, block);
         if i == 0 {
             return false;
         }
@@ -172,50 +208,64 @@ impl RedstoneGateBlock<ComparatorLikeProperties> for ComparatorBlock {
     }
 
     fn get_power(&self, world: &World, pos: BlockPos, state: &BlockState, block: &Block) -> u8 {
-        let redstone_level = abstract_redstone_gate::get_power::<ComparatorLikeProperties>(
+        let mut result_signal = abstract_redstone_gate::get_power::<ComparatorLikeProperties>(
             world, pos, state.id, block,
         );
 
         let props = ComparatorLikeProperties::from_state_id(state.id);
         let facing = props.facing;
-        let source_pos = pos.offset(facing.to_offset());
+        let mut target_pos = pos.offset(facing.to_offset());
-        let (source_block, source_state) = world.get_block_and_state(&source_pos);
+        let (target_block, target_state) = world.get_block_and_state(&target_pos);
 
-        if let Some(pumpkin_block) = world.block_registry.get_pumpkin_block(source_block.id)
+        if target_state.has_analog_output_signal() {
-            && let Some(level) = pumpkin_block.get_comparator_output(GetComparatorOutputArgs {
+            result_signal = world
-                world,
-                block: source_block,
-                state: source_state,
-                position: &source_pos,
-            })
-        {
-            return level;
-        }
-
-        if redstone_level < 15 && source_state.is_solid_block() {
-            let deeper_source_pos = source_pos.offset(facing.to_offset());
-            let (deeper_block, deeper_state) = world.get_block_and_state(&deeper_source_pos);
-
-            let itemframe_level =
-                Self::get_attached_itemframe_level(world, facing, deeper_source_pos);
-
-            let block_level = world
                 .block_registry
-                .get_pumpkin_block(deeper_block.id)
+                .get_pumpkin_block(target_block.id)
                 .and_then(|pumpkin_block| {
                     pumpkin_block.get_comparator_output(GetComparatorOutputArgs {
                         world,
-                        block: deeper_block,
+                        block: target_block,
-                        state: deeper_state,
+                        state: target_state,
-                        position: &deeper_source_pos,
+                        position: &target_pos,
                     })
-                });
+                })
+                .unwrap_or(0);
+        } else if result_signal < 15 && target_state.is_solid_block() {
+            target_pos = target_pos.offset(facing.to_offset());
+            let (target_block, target_state) = world.get_block_and_state(&target_pos);
 
-            if let Some(level) = itemframe_level.max(block_level) {
+            let item_frame_signal =
-                return level;
+                Self::get_attached_itemframe_level(world, facing, target_pos).map(i32::from);
+
+            let block_signal = target_state.has_analog_output_signal().then(|| {
+                let signal = world
+                    .block_registry
+                    .get_pumpkin_block(target_block.id)
+                    .and_then(|pumpkin_block| {
+                        pumpkin_block.get_comparator_output(GetComparatorOutputArgs {
+                            world,
+                            block: target_block,
+                            state: target_state,
+                            position: &target_pos,
+                        })
+                    })
+                    .unwrap_or(0);
+                i32::from(signal)
+            });
+
+            let item_frame_or_block_signal = match (item_frame_signal, block_signal) {
+                (Some(frame), Some(block)) => Some(frame.max(block)),
+                (Some(frame), None) => Some(frame),
+                (None, Some(block)) => Some(block),
+                (None, None) => None,
+            };
+
+            if let Some(signal) = item_frame_or_block_signal {
+                result_signal = signal as u8;
             }
         }
-        redstone_level
+
+        result_signal
     }
 
     fn get_update_delay_internal(&self, _state_id: BlockStateId, _block: &Block) -> u8 {
@@ -224,28 +274,6 @@ impl RedstoneGateBlock<ComparatorLikeProperties> for ComparatorBlock {
 }
 
 impl ComparatorBlock {
-    fn on_use(
-        &self,
-        mut props: ComparatorLikeProperties,
-        world: &Arc<World>,
-        block_pos: BlockPos,
-        block: &Block,
-    ) {
-        // Vanilla Parity TODO:
-        // playSound(player, pos, SoundEvents.COMPARATOR_CLICK, SoundSource.BLOCKS, 0.3F, pitch);
-        // Pitch is 0.55F if SUBTRACT, 0.5F if COMPARE.
-
-        props.mode = match props.mode {
-            ModeComparator::Compare => ModeComparator::Subtract,
-            ModeComparator::Subtract => ModeComparator::Compare,
-        };
-
-        let state_id = props.to_state_id(block);
-        world.set_block_state(&block_pos, state_id, BlockFlags::NOTIFY_ALL);
-
-        self.update(world, block_pos, BlockState::from_id(state_id), block);
-    }
-
     fn calculate_output_signal(
         &self,
         world: &World,

crates/pumpkin/src/block/blocks/spreading_snowy_block.rs

@@ -0,0 +1,213 @@
+use std::sync::Arc;
+
+use pumpkin_data::block_properties::{
+    GrassBlockLikeProperties, SnowLikeProperties, WaterLikeProperties,
+};
+use pumpkin_data::tag::{self, Taggable};
+use pumpkin_data::{Block, BlockDirection, BlockId, BlockState, BlockStateId};
+use pumpkin_util::math::position::BlockPos;
+use pumpkin_world::lighting::LightEngine;
+use pumpkin_world::world::BlockFlags;
+use rand::RngExt;
+
+use crate::block::{
+    BlockBehaviour, BlockMetadata, GetStateForNeighborUpdateArgs, OnPlaceArgs, RandomTickArgs,
+};
+use crate::world::World;
+
+/// Base logic for snowy blocks, matching vanilla `net.minecraft.world.level.block.SnowyBlock`.
+pub struct SnowyBlock;
+
+impl SnowyBlock {
+    #[must_use]
+    pub fn is_snowy_setting(above_state: &BlockState) -> bool {
+        above_state
+            .id
+            .to_block()
+            .has_tag(&tag::Block::MINECRAFT_SNOW)
+    }
+
+    #[must_use]
+    pub fn on_place(block: &Block, world: &World, position: &BlockPos) -> BlockStateId {
+        let block_above = world.get_block(&position.up());
+        let mut props = GrassBlockLikeProperties::from_state_id(block.default_state.id);
+        props.snowy = block_above.has_tag(&tag::Block::MINECRAFT_SNOW);
+        props.to_state_id(block)
+    }
+
+    #[must_use]
+    pub fn get_state_for_neighbor_update(args: &GetStateForNeighborUpdateArgs<'_>) -> BlockStateId {
+        if args.direction == BlockDirection::Up {
+            let block_above = args.world.get_block(args.neighbor_position);
+            let mut props = GrassBlockLikeProperties::from_state_id(args.state_id);
+            let should_be_snowy = block_above.has_tag(&tag::Block::MINECRAFT_SNOW);
+            if props.snowy == should_be_snowy {
+                return args.state_id;
+            }
+            props.snowy = should_be_snowy;
+            return props.to_state_id(args.block);
+        }
+        args.state_id
+    }
+}
+
+/// Abstract base logic for spreading snowy blocks (e.g. Grass Block, Mycelium),
+/// matching vanilla `net.minecraft.world.level.block.SpreadingSnowyBlock`.
+pub struct SpreadingSnowyBlock;
+
+impl SpreadingSnowyBlock {
+    #[must_use]
+    pub fn is_full_fluid(world: &World, pos: &BlockPos) -> bool {
+        let state = world.get_block_state(pos);
+        let block = state.id.to_block();
+        if block == &Block::WATER || block == &Block::LAVA {
+            return WaterLikeProperties::from_state_id(state.id).level == 0;
+        }
+        state.id.is_waterlogged()
+    }
+
+    #[must_use]
+    pub fn is_water_fluid(world: &World, pos: &BlockPos) -> bool {
+        let state = world.get_block_state(pos);
+        let block = state.id.to_block();
+        block == &Block::WATER || state.id.is_waterlogged()
+    }
+
+    #[must_use]
+    pub fn can_stay_alive_with_above(
+        state: &BlockState,
+        above_state: &BlockState,
+        is_full_fluid: bool,
+    ) -> bool {
+        if above_state.id.to_block() == &Block::SNOW {
+            let props = SnowLikeProperties::from_state_id(above_state.id);
+            if props.layers == 1 {
+                return true;
+            }
+        }
+
+        if is_full_fluid {
+            return false;
+        }
+
+        let light_dampening_top_face = LightEngine::get_light_dampening_into(
+            state,
+            above_state,
+            BlockDirection::Up,
+            above_state.opacity,
+        );
+        light_dampening_top_face < 15
+    }
+
+    #[must_use]
+    pub fn can_stay_alive(state: &BlockState, world: &World, pos: &BlockPos) -> bool {
+        let above = pos.up();
+        if !world.is_loaded(&above) {
+            return true;
+        }
+        let above_state = world.get_block_state(&above);
+        let is_full_fluid = Self::is_full_fluid(world, &above);
+        Self::can_stay_alive_with_above(state, above_state, is_full_fluid)
+    }
+
+    #[must_use]
+    pub fn can_propagate(state: &BlockState, world: &World, pos: &BlockPos) -> bool {
+        let above = pos.up();
+        if !world.is_loaded(&above) {
+            return false;
+        }
+        Self::can_stay_alive(state, world, pos) && !Self::is_water_fluid(world, &above)
+    }
+
+    pub fn random_tick(
+        state: &BlockState,
+        world: &Arc<World>,
+        pos: &BlockPos,
+        base_block: &'static Block,
+        default_block_state: &'static BlockState,
+    ) {
+        if !Self::can_stay_alive(state, world, pos) {
+            world.set_block_state(pos, base_block.default_state.id, BlockFlags::NOTIFY_ALL);
+        } else if world.get_max_local_raw_brightness(&pos.up()) >= 9 {
+            let mut rng = rand::rng();
+            for _ in 0..4 {
+                let dx = rng.random_range(0..3) - 1;
+                let dy = rng.random_range(0..5) - 3;
+                let dz = rng.random_range(0..3) - 1;
+                let test_pos = pos.add(dx, dy, dz);
+                if !world.is_loaded(&test_pos) {
+                    continue;
+                }
+                if world.get_block(&test_pos) == base_block
+                    && Self::can_propagate(default_block_state, world, &test_pos)
+                {
+                    let above_test = test_pos.up();
+                    let is_snowy = if world.is_loaded(&above_test) {
+                        SnowyBlock::is_snowy_setting(world.get_block_state(&above_test))
+                    } else {
+                        false
+                    };
+                    let mut props = GrassBlockLikeProperties::from_state_id(default_block_state.id);
+                    props.snowy = is_snowy;
+                    let new_state_id = props.to_state_id(default_block_state.id.to_block());
+                    world.set_block_state(&test_pos, new_state_id, BlockFlags::NOTIFY_ALL);
+                }
+            }
+        }
+    }
+}
+
+/// Podzol block, matching vanilla `net.minecraft.world.level.block.SnowyBlock` with `BlockItemIds.PODZOL`.
+pub struct PodzolBlock;
+
+impl BlockMetadata for PodzolBlock {
+    fn ids() -> Box<[BlockId]> {
+        [BlockId::PODZOL].into()
+    }
+}
+
+impl BlockBehaviour for PodzolBlock {
+    fn on_place(&self, args: OnPlaceArgs<'_>) -> BlockStateId {
+        SnowyBlock::on_place(args.block, args.world, args.position)
+    }
+
+    fn get_state_for_neighbor_update(
+        &self,
+        args: GetStateForNeighborUpdateArgs<'_>,
+    ) -> BlockStateId {
+        SnowyBlock::get_state_for_neighbor_update(&args)
+    }
+}
+
+/// Mycelium block, matching vanilla `net.minecraft.world.level.block.MyceliumBlock`.
+pub struct MyceliumBlock;
+
+impl BlockMetadata for MyceliumBlock {
+    fn ids() -> Box<[BlockId]> {
+        [BlockId::MYCELIUM].into()
+    }
+}
+
+impl BlockBehaviour for MyceliumBlock {
+    fn on_place(&self, args: OnPlaceArgs<'_>) -> BlockStateId {
+        SnowyBlock::on_place(args.block, args.world, args.position)
+    }
+
+    fn get_state_for_neighbor_update(
+        &self,
+        args: GetStateForNeighborUpdateArgs<'_>,
+    ) -> BlockStateId {
+        SnowyBlock::get_state_for_neighbor_update(&args)
+    }
+
+    fn random_tick(&self, args: RandomTickArgs<'_>) {
+        let state = args.world.get_block_state(args.position);
+        SpreadingSnowyBlock::random_tick(
+            state,
+            args.world,
+            args.position,
+            &Block::DIRT,
+            Block::MYCELIUM.default_state,
+        );
+    }
+}

crates/pumpkin/src/block/registry.rs

@@ -153,6 +153,7 @@ use crate::block::blocks::snow::LayeredSnowBlock;
 use crate::block::blocks::soul_sand::SoulSandBlock;
 use crate::block::blocks::spawner::SpawnerBlock;
 use crate::block::blocks::sponge::{SpongeBlock, WetSpongeBlock};
+use crate::block::blocks::spreading_snowy_block::{MyceliumBlock, PodzolBlock};
 use crate::block::blocks::stairs::StairBlock;
 use crate::block::blocks::structure_block::StructureBlock;
 use crate::block::blocks::structure_void::StructureVoidBlock;
@@ -401,6 +402,8 @@ pub fn default_registry() -> Arc<BlockRegistry> {
     manager.register(AmethystBlock);
     manager.register(BuddingAmethystBlock);
     manager.register(GrassBlock);
+    manager.register(MyceliumBlock);
+    manager.register(PodzolBlock);
     manager.register(RootedDirtBlock);
     manager.register(NyliumBlock);
     manager.register(BubbleColumnBlock);

crates/pumpkin/src/world/mod.rs

@@ -5357,8 +5357,10 @@ impl World {
             }
 
             if flags.contains(BlockFlags::NOTIFY_NEIGHBORS) {
-                self.update_neighbors(position, None);
+                self.update_neighbors_at(position, old_block, None);
-                // TODO: updateNeighbourForOutputSignal if blockState.hasAnalogOutputSignal()
+                if block_state_id.has_analog_output_signal() {
+                    self.update_neighbour_for_output_signal(position, new_block);
+                }
             }
 
             if !flags.contains(BlockFlags::MOVED) {
@@ -5402,9 +5404,15 @@ impl World {
             }
         }
 
-        self.level
+        let old_state = replaced_block_state_id.to_state();
-            .light_engine
+        let new_state = block_state_id.to_state();
-            .update_lighting_at(&self.level, *position);
+        if pumpkin_world::lighting::LightEngine::has_different_light_properties(
+            old_state, new_state,
+        ) {
+            self.level
+                .light_engine
+                .update_lighting_at(&self.level, *position);
+        }
 
         replaced_block_state_id
     }
@@ -5896,13 +5904,13 @@ impl World {
         (Block::from_state_id(id), id)
     }
 
-    /// Updates neighboring blocks of a block
+    /// Updates neighboring blocks of a block with a specified source block
-    pub fn update_neighbors(
+    pub fn update_neighbors_at(
         self: &Arc<Self>,
         block_pos: &BlockPos,
+        source_block: &Block,
         except: Option<BlockDirection>,
     ) {
-        let source_block = self.get_block(block_pos);
         for direction in BlockDirection::update_order() {
             if except.is_some_and(|d| d == direction) {
                 continue;
@@ -5948,6 +5956,16 @@ impl World {
         }
     }
 
+    /// Updates neighboring blocks of a block
+    pub fn update_neighbors(
+        self: &Arc<Self>,
+        block_pos: &BlockPos,
+        except: Option<BlockDirection>,
+    ) {
+        let source_block = self.get_block(block_pos);
+        self.update_neighbors_at(block_pos, source_block, except);
+    }
+
     pub fn update_neighbor(self: &Arc<Self>, neighbor_block_pos: &BlockPos, source_block: &Block) {
         let neighbor_block = self.get_block(neighbor_block_pos);
 
@@ -5975,6 +5993,30 @@ impl World {
         }
     }
 
+    pub fn update_neighbour_for_output_signal(
+        self: &Arc<Self>,
+        pos: &BlockPos,
+        changed_block: &Block,
+    ) {
+        for direction in BlockDirection::horizontal() {
+            let mut relative_pos = pos.offset(direction.to_offset());
+            if self.is_loaded(&relative_pos) {
+                let state = self.get_block_state(&relative_pos);
+                if state.id.to_block() == &Block::COMPARATOR {
+                    self.update_neighbor(&relative_pos, changed_block);
+                } else if state.is_solid_block() {
+                    relative_pos = relative_pos.offset(direction.to_offset());
+                    if self.is_loaded(&relative_pos) {
+                        let second_state = self.get_block_state(&relative_pos);
+                        if second_state.id.to_block() == &Block::COMPARATOR {
+                            self.update_neighbor(&relative_pos, changed_block);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
     pub fn update_from_neighbor_shapes(
         self: &Arc<Self>,
         state_id: BlockStateId,

tools/pumpkin-codegen/src/block.rs

@@ -635,6 +635,10 @@ impl BlockState {
     /// Bit flag indicating this state receives random tick events.
     const HAS_RANDOM_TICKS: u16 = 1 << 9;
 
+    const IS_SOLID_RENDER: u16 = 1 << 10;
+    const CAN_OCCLUDE: u16 = 1 << 11;
+    const HAS_ANALOG_OUTPUT_SIGNAL: u16 = 1 << 12;
+
     /// Returns `true` if this state receives random tick events.
     const fn has_random_ticks(&self) -> bool {
         self.state_flags & Self::HAS_RANDOM_TICKS != 0
@@ -649,6 +653,18 @@ impl BlockState {
         self.state_flags & Self::IS_LIQUID != 0
     }
 
+    pub const fn is_solid_render(&self) -> bool {
+        self.state_flags & Self::IS_SOLID_RENDER != 0
+    }
+
+    pub const fn can_occlude(&self) -> bool {
+        self.state_flags & Self::CAN_OCCLUDE != 0
+    }
+
+    pub const fn has_analog_output_signal(&self) -> bool {
+        self.state_flags & Self::HAS_ANALOG_OUTPUT_SIGNAL != 0
+    }
+
     /// Emits the `BlockState { … }` struct literal token stream for code generation.
     fn to_tokens(&self) -> TokenStream {
         let mut tokens = TokenStream::new();