Load chunk before adding joined player to the world

Author: PureGero

patches/server/0069-Optimization-Load-chunk-before-joining-player.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: PureGero <puregero@gmail.com>
+Date: Sat, 25 Oct 2025 19:24:51 +0900
+Subject: [PATCH] Optimization: Load chunk before joining player
+
+
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index dc99d088d6d915de789a1215df810a4a86212e42..973110b208a4026fd296663f58cd60960d9c6a1c 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -292,7 +292,7 @@ public abstract class PlayerList {
+ 
+         Location loc = ev.getSpawnLocation();
+         // ShreddedPaper start - join the region's thread
+-        ShreddedPaper.ensureSync(loc, () -> placeNewPlayer3(connection, player, clientData, worldserver1, loc, optional, s, s1));
++        worldserver1.getWorld().getChunkAtAsync(loc).thenRun(() -> placeNewPlayer3(connection, player, clientData, worldserver1, loc, optional, s, s1)); // ShreddedPaper - ensure spawn chunk is loaded
+     }
+ 
+     public void placeNewPlayer3(Connection connection, ServerPlayer player, CommonListenerCookie clientData, ServerLevel worldserver1, Location loc, Optional<CompoundTag> optional, String s, String s1) {