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/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/net/minecraft/world/level/chunk/ImposterProtoChunk.java
index d1331b580b3d27c77244b22a4ad15e719f686c8f..b430bb3c1bca935312bf6183b9f502c683b27c1f 100644
--- a/net/minecraft/world/level/chunk/ImposterProtoChunk.java
+++ b/net/minecraft/world/level/chunk/ImposterProtoChunk.java
@@ -91,6 +91,11 @@ 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);
     }