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	 * Gets the highest block Y value at a specific $x and $z
	 *
	 * @return int|null 0-255, or null if the column is empty
	 * @throws WorldException if the terrain is not generated
	 */
	public function getHighestBlockAt(int $x, int $z) : ?int{
		if(($chunk = $this->loadChunk($x >> Chunk::COORD_BIT_SIZE, $z >> Chunk::COORD_BIT_SIZE)) !== null){
			return $chunk->getHighestBlockAt($x & Chunk::COORD_MASK, $z & Chunk::COORD_MASK);
		}
		throw new WorldException("Cannot get highest block in an ungenerated chunk");
	}

	/**
	 * Returns whether the given position is in a loaded area of terrain.
	 */
	public function isInLoadedTerrain(Vector3 $pos) : bool{
		return $this->isChunkLoaded($pos->getFloorX() >> Chunk::COORD_BIT_SIZE, $pos->getFloorZ() >> Chunk::COORD_BIT_SIZE);
	}

	public function isChunkLoaded(int $x, int $z) : bool{

#0 plugins/GoCore/src/corndan/GoCore/managers/WorldManager(61): pocketmine\world\World->getHighestBlockAt(int 666, int 946)
#1 plugins/GoCore/src/corndan/GoCore/commands/RtpCommand(49): corndan\GoCore\managers\WorldManager::findSafePosition(object pocketmine\world\World#249702, int 666, int 946, int 30)
#2 plugins/GoCore/src/corndan/GoCore/GoCommand(40): corndan\GoCore\commands\RtpCommand->onCommand(object corndan\GoCore\player\GoPlayer#296137, array[0], string[3] rtp)
#3 pmsrc/src/command/SimpleCommandMap(212): corndan\GoCore\GoCommand->execute(object corndan\GoCore\player\GoPlayer#296137, string[3] rtp, array[0])
#4 pmsrc/src/Server(1442): pocketmine\command\SimpleCommandMap->dispatch(object corndan\GoCore\player\GoPlayer#296137, string[3] rtp)
#5 pmsrc/src/player/Player(1517): pocketmine\Server->dispatchCommand(object corndan\GoCore\player\GoPlayer#296137, string[3] rtp)
#6 pmsrc/src/network/mcpe/handler/InGamePacketHandler(860): pocketmine\player\Player->chat(string[4] /rtp)
#7 pmsrc/vendor/nethergamesmc/bedrock-protocol/src/CommandRequestPacket(59): pocketmine\network\mcpe\handler\InGamePacketHandler->handleCommandRequest(object pocketmine\network\mcpe\protocol\CommandRequestPacket#452955)
#8 pmsrc/src/network/mcpe/NetworkSession(518): pocketmine\network\mcpe\protocol\CommandRequestPacket->handle(object pocketmine\network\mcpe\handler\InGamePacketHandler#366817)
#9 pmsrc/src/network/mcpe/NetworkSession(455): pocketmine\network\mcpe\NetworkSession->handleDataPacket(object pocketmine\network\mcpe\protocol\CommandRequestPacket#452955, string[26] M./rtp..L..:......G1.....H)
#10 pmsrc/src/network/mcpe/raklib/RakLibInterface(219): pocketmine\network\mcpe\NetworkSession->handleEncoded(string[30] ..e./*)`.....j.?..}W....ie`...)
#11 pmsrc/vendor/pocketmine/raklib-ipc/src/RakLibToUserThreadMessageReceiver(40): pocketmine\network\mcpe\raklib\RakLibInterface->onPacketReceive(int 3, string[39] ..F..`lR/c.|gCm..WZ..}@....8Y..z. ./...)
#12 pmsrc/src/network/mcpe/raklib/RakLibInterface(111): raklib\server\ipc\RakLibToUserThreadMessageReceiver->handle(object pocketmine\network\mcpe\raklib\RakLibInterface#440840)
#13 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(120): pocketmine\network\mcpe\raklib\RakLibInterface->pocketmine\network\mcpe\raklib\{closure}()
#14 pmsrc/src/TimeTrackingSleeperHandler(58): pocketmine\snooze\SleeperHandler->processNotifications()
#15 pmsrc/vendor/pocketmine/snooze/src/SleeperHandler(79): pocketmine\TimeTrackingSleeperHandler->processNotifications()
#16 pmsrc/src/Server(1708): pocketmine\snooze\SleeperHandler->sleepUntil(float 1702843999.4585)
#17 pmsrc/src/Server(1090): pocketmine\Server->tickProcessor()
#18 pmsrc/src/PocketMine(334): pocketmine\Server->__construct(object pocketmine\thread\ThreadSafeClassLoader#3, object pocketmine\utils\MainLogger#6, string[23] /home/anpm5/servers/s1/, string[31] /home/anpm5/servers/s1/plugins/)
#19 pmsrc/src/PocketMine(357): pocketmine\server()
#20 pmsrc(11): require(string[64] phar:///home/anpm5/startup/PocketMine-MP.phar/src/PocketMine.php)