From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Sat, 12 Nov 2016 23:25:22 -0600
Subject: [PATCH] Filter bad data from ArmorStand and SpawnEgg items


diff --git a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
index 561b8d6fcf4d511fb026bcc2c02054e56589d0b7..e7404619877099aa2223da349e15090d2c9be1d0 100644
--- a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
@@ -318,6 +318,18 @@ public class FallingBlockEntity extends Entity {
     @Override
     protected void readAdditionalSaveData(CompoundTag nbt) {
         this.blockState = NbtUtils.readBlockState(this.level.holderLookup(Registries.BLOCK), nbt.getCompound("BlockState"));
+        // Paper start - Block FallingBlocks with Command Blocks
+        final Block b = this.blockState.getBlock();
+        if (this.level.paperConfig().entities.spawning.filterNbtDataFromSpawnEggsAndRelated
+            && (b == Blocks.COMMAND_BLOCK
+            || b == Blocks.REPEATING_COMMAND_BLOCK
+            || b == Blocks.CHAIN_COMMAND_BLOCK
+            || b == Blocks.JIGSAW
+            || b == Blocks.STRUCTURE_BLOCK
+            || b instanceof net.minecraft.world.level.block.GameMasterBlock)) {
+            this.blockState = Blocks.STONE.defaultBlockState();
+        }
+        // Paper end
         this.time = nbt.getInt("Time");
         if (nbt.contains("HurtEntities", 99)) {
             this.hurtEntities = nbt.getBoolean("HurtEntities");