From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Taiyou06 <kaandindar21@gmail.com>
Date: Thu, 8 May 2025 00:05:01 +0200
Subject: [PATCH] Save world async properly

Removed since Paper 1.21.4/5, added on Paper side

P.S from Tai: I've been using this fix for weeks in my own server but didn't had balls to push it as thought it may cause issues but, it's merged in paper 1.21.5 now.

diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
index ba1dd51e7187a80e8438e46383257c22f5382130..6cb0c14cb7aa243bbee6ca9ba57da4cc6eafdfd8 100644
--- a/net/minecraft/server/level/ServerLevel.java
+++ b/net/minecraft/server/level/ServerLevel.java
@@ -1439,7 +1439,7 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
         }
 
         if (doFull) {
-            this.saveLevelData(true);
+            this.saveLevelData(false); // Leaf - Save world async properly
         }
         // chunk autosave is already called by the ChunkSystem during unload processing (ChunkMap#processUnloads)
         // Copied from save()