From 62295994997312623ec6446cda6b83167d446b15 Mon Sep 17 00:00:00 2001
From: Dereku <iam@derekunavailable.direct>
Date: Fri, 30 Jan 2026 04:40:52 +0700
Subject: [PATCH] Do not send block updates if player does not have this chunk
 yet

---
 src/net/minecraft/server/observers/PlayerInstance.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/net/minecraft/server/observers/PlayerInstance.java b/src/net/minecraft/server/observers/PlayerInstance.java
index dd8ca09..dc73057 100644
--- a/src/net/minecraft/server/observers/PlayerInstance.java
+++ b/src/net/minecraft/server/observers/PlayerInstance.java
@@ -117,6 +117,11 @@ class PlayerInstance {
     public void sendPacketToPlayersInInstance(Packet var1) {
         for (int var2 = 0; var2 < this.players.size(); ++var2) {
             EntityPlayerMP var3 = (EntityPlayerMP) this.players.get(var2);
+            // Patch start
+            if (var1.isChunkDataPacket && var3.loadedChunks.contains(this.currentChunk)) {
+                continue;
+            }
+            // Patch end
             if (var3.field_420_ah.contains(this.currentChunk)) {
                 var3.playerNetServerHandler.sendPacket(var1);
             }