PaperMC/paper-server/nms-patches/net/minecraft/world/entity/item/EntityFallingBlock.patch

--- a/net/minecraft/world/entity/item/EntityFallingBlock.java
+++ b/net/minecraft/world/entity/item/EntityFallingBlock.java
@@ -52,6 +52,11 @@
 import net.minecraft.world.phys.Vec3D;
 import org.slf4j.Logger;
 
+// CraftBukkit start;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.EntityRemoveEvent;
+// CraftBukkit end
+
 public class EntityFallingBlock extends Entity {
 
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -87,10 +92,17 @@
     }
 
     public static EntityFallingBlock fall(World world, BlockPosition blockposition, IBlockData iblockdata) {
+        // CraftBukkit start
+        return fall(world, blockposition, iblockdata, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.DEFAULT);
+    }
+
+    public static EntityFallingBlock fall(World world, BlockPosition blockposition, IBlockData iblockdata, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason spawnReason) {
+        // CraftBukkit end
         EntityFallingBlock entityfallingblock = new EntityFallingBlock(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY(), (double) blockposition.getZ() + 0.5D, iblockdata.hasProperty(BlockProperties.WATERLOGGED) ? (IBlockData) iblockdata.setValue(BlockProperties.WATERLOGGED, false) : iblockdata);
+        if (!CraftEventFactory.callEntityChangeBlockEvent(entityfallingblock, blockposition, iblockdata.getFluidState().createLegacyBlock())) return entityfallingblock; // CraftBukkit
 
         world.setBlock(blockposition, iblockdata.getFluidState().createLegacyBlock(), 3);
-        world.addFreshEntity(entityfallingblock);
+        world.addFreshEntity(entityfallingblock, spawnReason); // CraftBukkit
         return entityfallingblock;
     }
 
@@ -130,7 +142,7 @@
     @Override
     public void tick() {
         if (this.blockState.isAir()) {
-            this.discard();
+            this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
         } else {
             Block block = this.blockState.getBlock();
 
@@ -159,7 +171,7 @@
                             this.spawnAtLocation((IMaterial) block);
                         }
 
-                        this.discard();
+                        this.discard(EntityRemoveEvent.Cause.DROP); // CraftBukkit - add Bukkit remove cause
                     }
                 } else {
                     IBlockData iblockdata = this.level().getBlockState(blockposition);
@@ -176,9 +188,15 @@
                                     this.blockState = (IBlockData) this.blockState.setValue(BlockProperties.WATERLOGGED, true);
                                 }
 
+                                // CraftBukkit start
+                                if (!CraftEventFactory.callEntityChangeBlockEvent(this, blockposition, this.blockState)) {
+                                    this.discard(EntityRemoveEvent.Cause.DESPAWN); // SPIGOT-6586 called before the event in previous versions
+                                    return;
+                                }
+                                // CraftBukkit end
                                 if (this.level().setBlock(blockposition, this.blockState, 3)) {
                                     ((WorldServer) this.level()).getChunkSource().chunkMap.broadcast(this, new PacketPlayOutBlockChange(blockposition, this.level().getBlockState(blockposition)));
-                                    this.discard();
+                                    this.discard(EntityRemoveEvent.Cause.DESPAWN);
                                     if (block instanceof Fallable) {
                                         ((Fallable) block).onLand(this.level(), blockposition, this.blockState, iblockdata, this);
                                     }
@@ -206,19 +224,19 @@
                                         }
                                     }
                                 } else if (this.dropItem && this.level().getGameRules().getBoolean(GameRules.RULE_DOENTITYDROPS)) {
-                                    this.discard();
+                                    this.discard(EntityRemoveEvent.Cause.DROP); // CraftBukkit - add Bukkit remove cause
                                     this.callOnBrokenAfterFall(block, blockposition);
                                     this.spawnAtLocation((IMaterial) block);
                                 }
                             } else {
-                                this.discard();
+                                this.discard(EntityRemoveEvent.Cause.DROP); // CraftBukkit - add Bukkit remove cause
                                 if (this.dropItem && this.level().getGameRules().getBoolean(GameRules.RULE_DOENTITYDROPS)) {
                                     this.callOnBrokenAfterFall(block, blockposition);
                                     this.spawnAtLocation((IMaterial) block);
                                 }
                             }
                         } else {
-                            this.discard();
+                            this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
                             this.callOnBrokenAfterFall(block, blockposition);
                         }
                     }