From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Tue, 1 Mar 2016 15:08:03 -0600
Subject: [PATCH] Remove invalid mob spawner tile entities


diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index a1c6225e57555c4bc736ceec7b6e915829a1e718..3830d0ef2936d37199a45035401efd6e19efdfa8 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -544,6 +544,11 @@ public class LevelChunk extends ChunkAccess {
             }
 
             // CraftBukkit start
+            // Paper start - Remove invalid mob spawner tile entities
+        } else if (blockEntity instanceof net.minecraft.world.level.block.entity.SpawnerBlockEntity
+            && !(getBlockState(blockposition).getBlock() instanceof net.minecraft.world.level.block.SpawnerBlock)) {
+            this.removeBlockEntity(blockEntity.getBlockPos());
+            // Paper end
         } else {
             System.out.println("Attempted to place a tile entity (" + blockEntity + ") at " + blockEntity.getBlockPos().getX() + "," + blockEntity.getBlockPos().getY() + "," + blockEntity.getBlockPos().getZ()
                 + " (" + this.getBlockState(blockposition) + ") where there was no entity tile!");