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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 18 Mar 2022 21:30:00 -0700
Subject: [PATCH] Fix async entity add due to fungus trees


diff --git a/src/main/java/net/minecraft/server/level/WorldGenRegion.java b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
index 68a6572da2acf2ea2e6996e653a0ffe405846575..a59eece9c7a8c33cb8ce963906e993c3462684fb 100644
--- a/src/main/java/net/minecraft/server/level/WorldGenRegion.java
+++ b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
@@ -236,6 +236,7 @@ public class WorldGenRegion implements WorldGenLevel {
         if (iblockdata.isAir()) {
             return false;
         } else {
+            if (drop) LOGGER.warn("Potential async entity add during worldgen", new Throwable()); // Paper - Fix async entity add due to fungus trees; log when this happens
             if (false) { // CraftBukkit - SPIGOT-6833: Do not drop during world generation
                 BlockEntity tileentity = iblockdata.hasBlockEntity() ? this.getBlockEntity(pos) : null;
 
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
index fce1e4bc4898f10c7e8ae788630a55e42e99dd20..5cdc44c73b536f2ed2dcd49dbeccf0f69f614dba 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
@@ -260,10 +260,10 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
                 ((ChorusFlowerBlock) Blocks.CHORUS_FLOWER).generatePlant(access, pos, random, 8);
                 return true;
             case CRIMSON_FUNGUS:
-                gen = TreeFeatures.CRIMSON_FUNGUS_PLANTED;
+                gen = this.isNormalWorld() ? TreeFeatures.CRIMSON_FUNGUS_PLANTED : TreeFeatures.CRIMSON_FUNGUS; // Paper - Fix async entity add due to fungus trees; if world gen, don't use planted version
                 break;
             case WARPED_FUNGUS:
-                gen = TreeFeatures.WARPED_FUNGUS_PLANTED;
+                gen = this.isNormalWorld() ? TreeFeatures.WARPED_FUNGUS_PLANTED : TreeFeatures.WARPED_FUNGUS; // Paper - Fix async entity add due to fungus trees; if world gen, don't use planted version
                 break;
             case AZALEA:
                 gen = TreeFeatures.AZALEA_TREE;