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
@@ -45,6 +45,8 @@
 import net.minecraft.world.phys.MovingObjectPositionBlock;
 import net.minecraft.world.phys.Vec3D;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class EntityFallingBlock extends Entity {
 
     private IBlockData blockState;
@@ -114,7 +116,7 @@
 
             if (this.time++ == 0) {
                 blockposition = this.getChunkCoordinates();
-                if (this.level.getType(blockposition).a(block)) {
+                if (this.level.getType(blockposition).a(block) && !CraftEventFactory.callEntityChangeBlockEvent(this, blockposition, Blocks.AIR.getBlockData()).isCancelled()) {
                     this.level.a(blockposition, false);
                 } else if (!this.level.isClientSide) {
                     this.die();
@@ -165,6 +167,11 @@
                                     this.blockState = (IBlockData) this.blockState.set(BlockProperties.WATERLOGGED, true);
                                 }
 
+                                // CraftBukkit start
+                                if (CraftEventFactory.callEntityChangeBlockEvent(this, blockposition, this.blockState).isCancelled()) {
+                                    return;
+                                }
+                                // CraftBukkit end
                                 if (this.level.setTypeAndData(blockposition, this.blockState, 3)) {
                                     ((WorldServer) this.level).getChunkProvider().chunkMap.broadcast(this, new PacketPlayOutBlockChange(blockposition, this.level.getType(blockposition)));
                                     this.die();
@@ -238,7 +245,7 @@
             if (i < 0) {
                 return false;
             } else {
-                Predicate predicate;
+                Predicate<Entity> predicate; // CraftBukkit - decompile error
                 DamageSource damagesource1;
 
                 if (this.blockState.getBlock() instanceof Fallable) {
@@ -254,7 +261,9 @@
                 float f2 = (float) Math.min(MathHelper.d((float) i * this.fallDamagePerDistance), this.fallDamageMax);
 
                 this.level.getEntities(this, this.getBoundingBox(), predicate).forEach((entity) -> {
+                    CraftEventFactory.entityDamage = this; // CraftBukkit
                     entity.damageEntity(damagesource1, f2);
+                    CraftEventFactory.entityDamage = null; // CraftBukkit
                 });
                 boolean flag = this.blockState.a((Tag) TagsBlock.ANVIL);