Fix: Block still placed when empty slot

pumpkin-inventory/src/player.rs

@@ -51,23 +51,29 @@ impl PlayerInventory {
     /// Useful functionality for plugins in the future.
     pub fn set_slot(
         &mut self,
-        slot: usize,
+        slot: u16,
         item: Option<ItemStack>,
         item_allowed_override: bool,
     ) -> Result<(), InventoryError> {
-        if item_allowed_override {
         if !(0..=45).contains(&slot) {
-                Err(InventoryError::InvalidSlot)?
+            return Err(InventoryError::InvalidSlot);
         }
-            *self.all_slots()[slot] = item;
-            return Ok(());
+
+        match item_allowed_override {
+            true => {
+                *self.all_slots()[slot as usize] = item;
             }
+            false => {
+                let slot = slot as usize;
                 let slot_condition = self.slot_condition(slot)?;
                 if let Some(item) = item {
                     if slot_condition(&item) {
-                *self.all_slots()[slot] = Some(item);
+                        self.all_slots()[slot] = &mut Some(item);
                     }
                 }
+            }
+        }
+
         Ok(())
     }
     #[allow(clippy::type_complexity)]

pumpkin/src/client/player_packet.rs

@@ -660,9 +660,9 @@ impl Player {
         let valid_slot = packet.slot >= 1 && packet.slot <= 45;
         if valid_slot {
             self.inventory.lock().await.set_slot(
-                packet.slot as usize,
+                packet.slot as u16,
                 packet.clicked_item.to_item(),
-                false,
+                true,
             )?;
         };
         // TODO: The Item was droped per drag and drop,