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
@@ -49,6 +49,10 @@
 import net.minecraft.world.phys.Vec3D;
 import org.slf4j.Logger;
 
+// CraftBukkit start;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+// CraftBukkit end
+
 public class EntityFallingBlock extends Entity {
 
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -83,10 +87,17 @@
     }
 
     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;
     }
 
@@ -169,6 +180,12 @@
                                     this.blockState = (IBlockData) this.blockState.setValue(BlockProperties.WATERLOGGED, true);
                                 }
 
+                                // CraftBukkit start
+                                if (!CraftEventFactory.callEntityChangeBlockEvent(this, blockposition, this.blockState)) {
+                                    this.discard(); // 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();
@@ -255,7 +272,9 @@
                 float f2 = (float) Math.min(MathHelper.floor((float) i * this.fallDamagePerDistance), this.fallDamageMax);
 
                 this.level().getEntities((Entity) this, this.getBoundingBox(), predicate).forEach((entity) -> {
+                    CraftEventFactory.entityDamage = this; // CraftBukkit
                     entity.hurt(damagesource2, f2);
+                    CraftEventFactory.entityDamage = null; // CraftBukkit
                 });
                 boolean flag = this.blockState.is(TagsBlock.ANVIL);