From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 23 Apr 2023 07:08:26 -0700
Subject: [PATCH] Block reading in-world tile entities on worldgen threads

The returned TE may be in the world, in which case it is unsafe
for the current thread to modify or access its contents.

diff --git a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
index d7d332d8ba3442887e80d2c3d7bddb9de2674c2d..f135ed136aa01bf18b4bd107109db8f8ebf440d2 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
@@ -92,6 +92,11 @@ public class ImposterProtoChunk extends ProtoChunk implements ca.spottedleaf.moo
     @Nullable
     @Override
     public BlockEntity getBlockEntity(BlockPos pos) {
+        // Folia start - block reading possibly in-world block data for worldgen threads
+        if (!this.allowWrites && !ca.spottedleaf.moonrise.common.util.TickThread.isTickThread()) {
+            return null;
+        }
+        // Folia end - block reading possibly in-world block data for worldgen threads
         return this.wrapped.getBlockEntity(pos);
     }