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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 28 Dec 2021 07:19:01 -0800
Subject: [PATCH] Execute chunk tasks fairly for worlds while waiting for next
 tick

Currently, only the first world would have had tasks executed.
This might result in chunks loading far slower in the nether,
for example.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 7e85d9e00f41abb26fbf0e21e70ab82018f6f2a6..12a3480823722cd907654248ae2a977ca3f7bb0f 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1419,6 +1419,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         if (super.pollTask()) {
             return true;
         } else {
+            boolean ret = false; // Paper - force execution of all worlds, do not just bias the first
             if (this.tickRateManager.isSprinting() || this.haveTime()) {
                 Iterator iterator = this.getAllLevels().iterator();
 
@@ -1426,12 +1427,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
                     ServerLevel worldserver = (ServerLevel) iterator.next();
 
                     if (worldserver.getChunkSource().pollTask()) {
-                        return true;
+                        ret = true; // Paper - force execution of all worlds, do not just bias the first
                     }
                 }
             }
 
-            return false;
+            return ret; // Paper - force execution of all worlds, do not just bias the first
         }
     }