diff --git a/src/network/mcpe/ChunkRequestTask.php b/src/network/mcpe/ChunkRequestTask.php
index d90e0cd32..395a536b2 100644
--- a/src/network/mcpe/ChunkRequestTask.php
+++ b/src/network/mcpe/ChunkRequestTask.php
@@ -66,7 +66,7 @@ class ChunkRequestTask extends AsyncTask{
 	}
 
 	public function onRun() : void{
-		$chunk = FastChunkSerializer::deserialize($this->chunk);
+		$chunk = FastChunkSerializer::deserialize($this->chunk, $this->chunkX, $this->chunkZ);
 		$subCount = ChunkSerializer::getSubChunkCount($chunk);
 		$payload = ChunkSerializer::serialize($chunk, RuntimeBlockMapping::getInstance(), $this->tiles);
 		$this->setResult($this->compressor->compress(PacketBatch::fromPackets(LevelChunkPacket::withoutCache($this->chunkX, $this->chunkZ, $subCount, $payload))->getBuffer()));
diff --git a/src/world/format/io/FastChunkSerializer.php b/src/world/format/io/FastChunkSerializer.php
index b180c75bb..3151a7bb6 100644
--- a/src/world/format/io/FastChunkSerializer.php
+++ b/src/world/format/io/FastChunkSerializer.php
@@ -61,8 +61,6 @@ final class FastChunkSerializer{
 		$includeLight = $includeLight && $chunk->isLightPopulated() === true;
 
 		$stream = new BinaryStream();
-		$stream->putInt($chunk->getX());
-		$stream->putInt($chunk->getZ());
 		$stream->putByte(
 			($includeLight ? self::FLAG_HAS_LIGHT : 0) |
 			($chunk->isPopulated() ? self::FLAG_POPULATED : 0) |
@@ -109,11 +107,9 @@ final class FastChunkSerializer{
 	/**
 	 * Deserializes a fast-serialized chunk
 	 */
-	public static function deserialize(string $data) : Chunk{
+	public static function deserialize(string $data, int $chunkX, int $chunkZ) : Chunk{
 		$stream = new BinaryStream($data);
 
-		$x = $stream->getInt();
-		$z = $stream->getInt();
 		$flags = $stream->getByte();
 		$lightPopulated = (bool) ($flags & self::FLAG_HAS_LIGHT);
 		$terrainPopulated = (bool) ($flags & self::FLAG_POPULATED);
@@ -148,7 +144,7 @@ final class FastChunkSerializer{
 			}
 		}
 
-		$chunk = new Chunk($x, $z, $subChunks, null, null, $biomeIds, $heightMap);
+		$chunk = new Chunk($chunkX, $chunkZ, $subChunks, null, null, $biomeIds, $heightMap);
 		$chunk->setGenerated($terrainGenerated);
 		$chunk->setPopulated($terrainPopulated);
 		$chunk->setLightPopulated($lightPopulated);
diff --git a/src/world/generator/PopulationTask.php b/src/world/generator/PopulationTask.php
index 377acc34e..fcee7cd24 100644
--- a/src/world/generator/PopulationTask.php
+++ b/src/world/generator/PopulationTask.php
@@ -28,6 +28,7 @@ use pocketmine\world\format\Chunk;
 use pocketmine\world\format\io\FastChunkSerializer;
 use pocketmine\world\SimpleChunkManager;
 use pocketmine\world\World;
+use function intdiv;
 
 class PopulationTask extends AsyncTask{
 	private const TLS_KEY_WORLD = "world";
@@ -36,6 +37,11 @@ class PopulationTask extends AsyncTask{
 	public $state;
 	/** @var int */
 	public $worldId;
+	/** @var int */
+	private $chunkX;
+	/** @var int */
+	private $chunkZ;
+
 	/** @var string */
 	public $chunk;
 
@@ -62,6 +68,8 @@ class PopulationTask extends AsyncTask{
 	public function __construct(World $world, Chunk $chunk){
 		$this->state = true;
 		$this->worldId = $world->getId();
+		$this->chunkX = $chunk->getX();
+		$this->chunkZ = $chunk->getZ();
 		$this->chunk = FastChunkSerializer::serializeWithoutLight($chunk);
 
 		foreach($world->getAdjacentChunks($chunk->getX(), $chunk->getZ()) as $i => $c){
@@ -83,7 +91,7 @@ class PopulationTask extends AsyncTask{
 		/** @var Chunk[] $chunks */
 		$chunks = [];
 
-		$chunk = FastChunkSerializer::deserialize($this->chunk);
+		$chunk = FastChunkSerializer::deserialize($this->chunk, $this->chunkX, $this->chunkZ);
 
 		for($i = 0; $i < 9; ++$i){
 			if($i === 4){
@@ -93,9 +101,9 @@ class PopulationTask extends AsyncTask{
 			$zz = -1 + (int) ($i / 3);
 			$ck = $this->{"chunk$i"};
 			if($ck === null){
-				$chunks[$i] = new Chunk($chunk->getX() + $xx, $chunk->getZ() + $zz);
+				$chunks[$i] = new Chunk($this->chunkX + $xx, $this->chunkZ + $zz);
 			}else{
-				$chunks[$i] = FastChunkSerializer::deserialize($ck);
+				$chunks[$i] = FastChunkSerializer::deserialize($ck, $this->chunkX + $xx, $this->chunkZ + $zz);
 			}
 		}
 
@@ -134,7 +142,7 @@ class PopulationTask extends AsyncTask{
 				$world->registerGeneratorToWorker($this->worker->getAsyncWorkerId());
 			}
 
-			$chunk = FastChunkSerializer::deserialize($this->chunk);
+			$chunk = FastChunkSerializer::deserialize($this->chunk, $this->chunkX, $this->chunkZ);
 
 			for($i = 0; $i < 9; ++$i){
 				if($i === 4){
@@ -142,12 +150,15 @@ class PopulationTask extends AsyncTask{
 				}
 				$c = $this->{"chunk$i"};
 				if($c !== null){
-					$c = FastChunkSerializer::deserialize($c);
-					$world->generateChunkCallback($c->getX(), $c->getZ(), $this->state ? $c : null);
+					$xx = -1 + $i % 3;
+					$zz = -1 + intdiv($i, 3);
+
+					$c = FastChunkSerializer::deserialize($c, $this->chunkX + $xx, $this->chunkZ + $zz);
+					$world->generateChunkCallback($this->chunkX + $xx, $this->chunkZ + $zz, $this->state ? $c : null);
 				}
 			}
 
-			$world->generateChunkCallback($chunk->getX(), $chunk->getZ(), $this->state ? $chunk : null);
+			$world->generateChunkCallback($this->chunkX, $this->chunkZ, $this->state ? $chunk : null);
 		}
 	}
 }
diff --git a/src/world/light/LightPopulationTask.php b/src/world/light/LightPopulationTask.php
index 25828b117..3f5c59a29 100644
--- a/src/world/light/LightPopulationTask.php
+++ b/src/world/light/LightPopulationTask.php
@@ -60,7 +60,7 @@ class LightPopulationTask extends AsyncTask{
 	}
 
 	public function onRun() : void{
-		$chunk = FastChunkSerializer::deserialize($this->chunk);
+		$chunk = FastChunkSerializer::deserialize($this->chunk, $this->chunkX, $this->chunkZ);
 
 		$manager = new SimpleChunkManager();
 		$manager->setChunk($this->chunkX, $this->chunkZ, $chunk);