diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 1489fd781..801083f14 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -122,7 +122,6 @@ use pocketmine\network\mcpe\protocol\types\CommandParameter;
 use pocketmine\network\mcpe\protocol\types\ContainerIds;
 use pocketmine\network\mcpe\protocol\types\PlayerPermissions;
 use pocketmine\network\mcpe\protocol\UpdateAttributesPacket;
-use pocketmine\network\mcpe\protocol\UpdateBlockPacket;
 use pocketmine\network\mcpe\ProcessLoginTask;
 use pocketmine\permission\PermissibleBase;
 use pocketmine\permission\PermissionAttachment;
@@ -2208,7 +2207,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 		$blocks = $target->getAllSides();
 		$blocks[] = $target;
 
-		$this->level->sendBlocks([$this], $blocks, UpdateBlockPacket::FLAG_ALL_PRIORITY);
+		$this->level->sendBlocks([$this], $blocks);
 
 		foreach($blocks as $b){
 			$tile = $this->level->getTile($b);
@@ -2255,7 +2254,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 		/** @var Block[] $blocks */
 		$blocks = array_merge($target->getAllSides(), $block->getAllSides()); //getAllSides() on each of these will include $target and $block because they are next to each other
 
-		$this->level->sendBlocks([$this], $blocks, UpdateBlockPacket::FLAG_ALL_PRIORITY);
+		$this->level->sendBlocks([$this], $blocks);
 
 		return false;
 	}
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 8d4699965..13cbbb65a 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -799,7 +799,7 @@ class Level implements ChunkManager, Metadatable{
 							$p->onChunkChanged($chunk);
 						}
 					}else{
-						$this->sendBlocks($this->getChunkPlayers($chunkX, $chunkZ), $blocks, UpdateBlockPacket::FLAG_ALL);
+						$this->sendBlocks($this->getChunkPlayers($chunkX, $chunkZ), $blocks);
 					}
 				}
 			}else{
@@ -870,62 +870,28 @@ class Level implements ChunkManager, Metadatable{
 	/**
 	 * @param Player[]  $target
 	 * @param Vector3[] $blocks
-	 * @param int       $flags
-	 * @param bool      $optimizeRebuilds
 	 */
-	public function sendBlocks(array $target, array $blocks, int $flags = UpdateBlockPacket::FLAG_NONE, bool $optimizeRebuilds = false){
+	public function sendBlocks(array $target, array $blocks){
 		$packets = [];
-		if($optimizeRebuilds){
-			$chunks = [];
-			foreach($blocks as $b){
-				if(!($b instanceof Vector3)){
-					throw new \TypeError("Expected Vector3 in blocks array, got " . (is_object($b) ? get_class($b) : gettype($b)));
-				}
-				$pk = new UpdateBlockPacket();
 
-				$first = false;
-				if(!isset($chunks[$index = Level::chunkHash($b->x >> 4, $b->z >> 4)])){
-					$chunks[$index] = true;
-					$first = true;
-				}
-
-				$pk->x = $b->x;
-				$pk->y = $b->y;
-				$pk->z = $b->z;
-
-				if($b instanceof Block){
-					$pk->blockRuntimeId = $b->getRuntimeId();
-				}else{
-					$fullBlock = $this->getFullBlock($b->x, $b->y, $b->z);
-					$pk->blockRuntimeId = BlockFactory::toStaticRuntimeId($fullBlock >> 4,  $fullBlock & 0xf);
-				}
-
-				$pk->flags = $first ? $flags : UpdateBlockPacket::FLAG_NONE;
-
-				$packets[] = $pk;
+		foreach($blocks as $b){
+			if(!($b instanceof Vector3)){
+				throw new \TypeError("Expected Vector3 in blocks array, got " . (is_object($b) ? get_class($b) : gettype($b)));
 			}
-		}else{
-			foreach($blocks as $b){
-				if(!($b instanceof Vector3)){
-					throw new \TypeError("Expected Vector3 in blocks array, got " . (is_object($b) ? get_class($b) : gettype($b)));
-				}
-				$pk = new UpdateBlockPacket();
+			$pk = new UpdateBlockPacket();
 
-				$pk->x = $b->x;
-				$pk->y = $b->y;
-				$pk->z = $b->z;
+			$pk->x = $b->x;
+			$pk->y = $b->y;
+			$pk->z = $b->z;
 
-				if($b instanceof Block){
-					$pk->blockRuntimeId = $b->getRuntimeId();
-				}else{
-					$fullBlock = $this->getFullBlock($b->x, $b->y, $b->z);
-					$pk->blockRuntimeId = BlockFactory::toStaticRuntimeId($fullBlock >> 4,  $fullBlock & 0xf);
-				}
-
-				$pk->flags = $flags;
-
-				$packets[] = $pk;
+			if($b instanceof Block){
+				$pk->blockRuntimeId = $b->getRuntimeId();
+			}else{
+				$fullBlock = $this->getFullBlock($b->x, $b->y, $b->z);
+				$pk->blockRuntimeId = BlockFactory::toStaticRuntimeId($fullBlock >> 4,  $fullBlock & 0xf);
 			}
+
+			$packets[] = $pk;
 		}
 
 		$this->server->broadcastPackets($target, $packets);
@@ -1547,7 +1513,7 @@ class Level implements ChunkManager, Metadatable{
 			unset($this->blockCache[$chunkHash][$blockHash]);
 
 			if($direct){
-				$this->sendBlocks($this->getChunkPlayers($pos->x >> 4, $pos->z >> 4), [$block], UpdateBlockPacket::FLAG_ALL_PRIORITY);
+				$this->sendBlocks($this->getChunkPlayers($pos->x >> 4, $pos->z >> 4), [$block]);
 				unset($this->chunkCache[$chunkHash], $this->changedBlocks[$chunkHash][$blockHash]);
 			}else{
 				if(!isset($this->changedBlocks[$chunkHash])){
diff --git a/src/pocketmine/network/mcpe/protocol/UpdateBlockPacket.php b/src/pocketmine/network/mcpe/protocol/UpdateBlockPacket.php
index db7066328..254f54bd0 100644
--- a/src/pocketmine/network/mcpe/protocol/UpdateBlockPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/UpdateBlockPacket.php
@@ -31,15 +31,6 @@ use pocketmine\network\mcpe\handler\SessionHandler;
 class UpdateBlockPacket extends DataPacket{
 	public const NETWORK_ID = ProtocolInfo::UPDATE_BLOCK_PACKET;
 
-	public const FLAG_NONE      = 0b0000;
-	public const FLAG_NEIGHBORS = 0b0001;
-	public const FLAG_NETWORK   = 0b0010;
-	public const FLAG_NOGRAPHIC = 0b0100;
-	public const FLAG_PRIORITY  = 0b1000;
-
-	public const FLAG_ALL = self::FLAG_NEIGHBORS | self::FLAG_NETWORK;
-	public const FLAG_ALL_PRIORITY = self::FLAG_ALL | self::FLAG_PRIORITY;
-
 	public const DATA_LAYER_NORMAL = 0;
 	public const DATA_LAYER_LIQUID = 1;
 
@@ -51,8 +42,12 @@ class UpdateBlockPacket extends DataPacket{
 	public $y;
 	/** @var int */
 	public $blockRuntimeId;
-	/** @var int */
-	public $flags;
+	/**
+	 * @var int
+	 * Flags are used by MCPE internally for block setting, but only flag 2 (network flag) is relevant for network.
+	 * This field is pointless really.
+	 */
+	public $flags = 0x02;
 	/** @var int */
 	public $dataLayerId = self::DATA_LAYER_NORMAL;