PaperMC/Spigot-Server-Patches/0544-Don-t-mark-null-chunk-sections-for-block-updates.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Mariell Hoversholm <proximyst@proximyst.com>
Date: Fri, 14 Aug 2020 23:41:19 +0200
Subject: [PATCH] Don't mark null chunk sections for block updates


diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index 8146d88a90a758760e383985170d580372577615..c69b5a2c7b8061a65b2d5bb7ceb3ffe39dc36b8c 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -420,6 +420,7 @@ public class PlayerChunk {
                         this.a(world, blockposition, iblockdata);
                     } else {
                         ChunkSection chunksection = chunk.getSections()[sectionposition.getY()];
+                        if (chunksection == null) chunksection = new ChunkSection(sectionposition.getY(), chunk, world, true); // Paper - make a new chunk section if none was found
                         PacketPlayOutMultiBlockChange packetplayoutmultiblockchange = new PacketPlayOutMultiBlockChange(sectionposition, shortset, chunksection, this.x);
 
                         this.a(packetplayoutmultiblockchange, false);