1 files changed, 40 insertions, 0 deletions
diff --git a/patches/server/0811-Fix-NBT-pieces-overriding-a-block-entity-during-worl.patch b/patches/server/0811-Fix-NBT-pieces-overriding-a-block-entity-during-worl.patch
new file mode 100644
index 0000000000..5fb11187b2
--- /dev/null
+++ b/patches/server/0811-Fix-NBT-pieces-overriding-a-block-entity-during-worl.patch
@@ -0,0 +1,40 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: etil2jz <[email protected]>
+Date: Sat, 2 Apr 2022 23:29:24 +0200
+Subject: [PATCH] Fix NBT pieces overriding a block entity during worldgen
+ deadlock
+
+By checking if the world passed into StructureTemplate's placeInWorld
+is not a WorldGenRegion, we can bypass the deadlock entirely.
+See https://bugs.mojang.com/browse/MC-246262
+
+diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
+index 020e436f77f9f2de631727c00ccd41e9293b1f47..25872fc1e827ee1f736c121282585cacec532fb8 100644
+--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
++++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
+@@ -266,7 +266,11 @@ public class StructureTemplate {
+ 
+                         if (definedstructure_blockinfo.nbt != null) {
+                             tileentity = world.getBlockEntity(blockposition2);
+-                            Clearable.tryClear(tileentity);
++                            // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
++                            if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
++                                Clearable.tryClear(tileentity);
++                            }
++                            // Paper end
+                             world.setBlock(blockposition2, Blocks.BARRIER.defaultBlockState(), 20);
+                         }
+ 
+@@ -379,7 +383,11 @@ public class StructureTemplate {
+                         if (pair1.getSecond() != null) {
+                             tileentity = world.getBlockEntity(blockposition6);
+                             if (tileentity != null) {
+-                                tileentity.setChanged();
++                                // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
++                                if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
++                                    tileentity.setChanged();
++                                }
++                                // Paper end
+                             }
+                         }
+                     }