From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Tue, 31 Aug 2021 17:12:01 -0700
Subject: [PATCH] Use updatingChunks for flush saving


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index d9f1601c49e7e7fc06a6f9bf0cb13aacd66f190c..59073cbae4ff8d8c38934a6d0ea11545a30a7013 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -950,9 +950,17 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
     }
     // Paper end
 
+    // Paper start
+    public Long2ObjectLinkedOpenHashMap<ChunkHolder> getVisibleChunks() {
+        synchronized (this.updatingChunks) {
+            return this.updatingChunks.getVisibleMap().clone();
+        }
+    }
+    // Paper end
+
     protected void saveAllChunks(boolean flush) {
         if (flush) {
-            List<ChunkHolder> list = (List) this.visibleChunkMap.values().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).peek(ChunkHolder::refreshAccessibility).collect(Collectors.toList());
+            List<ChunkHolder> list = (List) this.getVisibleChunks().values().stream().filter(ChunkHolder::wasAccessibleSinceLastSave).peek(ChunkHolder::refreshAccessibility).collect(Collectors.toList()); // Paper
             MutableBoolean mutableboolean = new MutableBoolean();
 
             do {