SPIGOT-6980: Since 1.18.2, World#isChunkLoaded returned false for chunks that have just been loaded (e.g. inside ChunkLoadEvent).

Some changes of the 1.18.2 update have been reverted to resolve this regression.

By: blablubbabc <lukas@wirsindwir.de>

paper-server/nms-patches/net/minecraft/server/level/ChunkProviderServer.patch

@@ -10,7 +10,7 @@
 +        if (chunk == null) {
 +            return false;
 +        }
-+        return chunk.getFullChunk() != null;
++        return chunk.getFullChunkNow() != null;
 +    }
 +
 +    public Chunk getChunkUnchecked(int chunkX, int chunkZ) {
@@ -18,7 +18,7 @@
 +        if (chunk == null) {
 +            return null;
 +        }
-+        return chunk.getFullChunk();
++        return chunk.getFullChunkNowUnchecked();
 +    }
 +    // CraftBukkit end
 +