From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sat, 7 Mar 2020 00:07:51 +0000
Subject: [PATCH] Validate tripwire hook placement before update


diff --git a/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java b/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
index 3a5252afa9681fb1956493bead27e6cdb13679ca..0cfa1abca2c5744a4147b05905983ae4acaa569a 100644
--- a/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/TripWireHookBlock.java
@@ -174,6 +174,7 @@ public class TripWireHookBlock extends Block {
 
         this.playSound(world, pos, flag4, flag5, flag2, flag3);
         if (!beingRemoved) {
+            if (world.getBlockState(pos).getBlock() == Blocks.TRIPWIRE_HOOK) // Paper - validate
             world.setBlock(pos, (BlockState) iblockdata3.setValue(TripWireHookBlock.FACING, enumdirection), 3);
             if (flag1) {
                 this.notifyNeighbors(world, pos, enumdirection);