From a9c21212ccc71c68ef17076e300d53a23a7ed836 Mon Sep 17 00:00:00 2001
From: Trigary <trigary0@gmail.com>
Date: Mon, 17 Feb 2020 22:53:33 +0100
Subject: [PATCH] fix blockstate capture undoing


diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 3c966b4ab..baad98517 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -349,7 +349,9 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
             Block block = iblockdata.getBlock();
 
             // CraftBukkit start - capture blockstates
+            boolean capturedBlockState = false; //Paper - fix blockstate capture undoing
             if (this.captureBlockStates && !this.capturedBlockStates.containsKey(blockposition)) {
+                capturedBlockState = true; //Paper - fix blockstate capture undoing
                 CraftBlockState blockstate = (CraftBlockState) world.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()).getState(); // Paper - use CB getState to get a suitable snapshot
                 this.capturedBlockStates.put(blockposition.immutableCopy(), blockstate);
             }
@@ -360,7 +362,7 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
 
             if (iblockdata1 == null) {
                 // CraftBukkit start - remove blockstate if failed
-                if (this.captureBlockStates) {
+                if (/*this.captureBlockStates*/ capturedBlockState) { //Paper - fix blockstate capture undoing
                     this.capturedBlockStates.remove(blockposition);
                 }
                 // CraftBukkit end
-- 
2.16.1.windows.4