diff --git a/src/block/BlockBreakInfo.php b/src/block/BlockBreakInfo.php
index 8cfa425dc4..e77e06cfd9 100644
--- a/src/block/BlockBreakInfo.php
+++ b/src/block/BlockBreakInfo.php
@@ -154,7 +154,7 @@ class BlockBreakInfo{
 
 		$efficiency = $item->getMiningEfficiency(($this->toolType & $item->getBlockToolType()) !== 0);
 		if($efficiency <= 0){
-			throw new \InvalidArgumentException(get_class($item) . " has invalid mining efficiency: expected >= 0, got $efficiency");
+			throw new \InvalidArgumentException(get_class($item) . " must have a positive mining efficiency, but got $efficiency");
 		}
 
 		$base /= $efficiency;
diff --git a/src/data/bedrock/block/convert/BlockStateDeserializerHelper.php b/src/data/bedrock/block/convert/BlockStateDeserializerHelper.php
index 342f31490d..1d7b4bb76e 100644
--- a/src/data/bedrock/block/convert/BlockStateDeserializerHelper.php
+++ b/src/data/bedrock/block/convert/BlockStateDeserializerHelper.php
@@ -131,7 +131,8 @@ final class BlockStateDeserializerHelper{
 		//TODO: check if these need any special treatment to get the appropriate data to both halves of the door
 		return $block
 			->setTop($in->readBool(BlockStateNames::UPPER_BLOCK_BIT))
-			->setFacing($in->readCardinalHorizontalFacing())
+			//a door facing "east" is actually facing north - thanks mojang
+			->setFacing(Facing::rotateY($in->readCardinalHorizontalFacing(), clockwise: false))
 			->setHingeRight($in->readBool(BlockStateNames::DOOR_HINGE_BIT))
 			->setOpen($in->readBool(BlockStateNames::OPEN_BIT));
 	}
diff --git a/src/data/bedrock/block/convert/BlockStateSerializerHelper.php b/src/data/bedrock/block/convert/BlockStateSerializerHelper.php
index fa0591669c..a250441530 100644
--- a/src/data/bedrock/block/convert/BlockStateSerializerHelper.php
+++ b/src/data/bedrock/block/convert/BlockStateSerializerHelper.php
@@ -100,7 +100,8 @@ final class BlockStateSerializerHelper{
 	public static function encodeDoor(Door $block, Writer $out) : Writer{
 		return $out
 			->writeBool(BlockStateNames::UPPER_BLOCK_BIT, $block->isTop())
-			->writeCardinalHorizontalFacing($block->getFacing())
+			//a door facing north is encoded as "east"
+			->writeCardinalHorizontalFacing(Facing::rotateY($block->getFacing(), clockwise: true))
 			->writeBool(BlockStateNames::DOOR_HINGE_BIT, $block->isHingeRight())
 			->writeBool(BlockStateNames::OPEN_BIT, $block->isOpen());
 	}
diff --git a/src/resourcepacks/ResourcePackManager.php b/src/resourcepacks/ResourcePackManager.php
index c4668eb2a7..ad44177691 100644
--- a/src/resourcepacks/ResourcePackManager.php
+++ b/src/resourcepacks/ResourcePackManager.php
@@ -26,6 +26,7 @@ namespace pocketmine\resourcepacks;
 use pocketmine\utils\Config;
 use pocketmine\utils\Filesystem;
 use pocketmine\utils\Utils;
+use Ramsey\Uuid\Uuid;
 use Symfony\Component\Filesystem\Path;
 use function array_keys;
 use function copy;
@@ -103,9 +104,14 @@ class ResourcePackManager{
 			try{
 				$newPack = $this->loadPackFromPath(Path::join($this->path, $pack));
 
-				$this->resourcePacks[] = $newPack;
 				$index = strtolower($newPack->getPackId());
+				if(!Uuid::isValid($index)){
+					//TODO: we should use Uuid in ResourcePack interface directly but that would break BC
+					//for now we need to validate this here to make sure it doesn't cause crashes later on
+					throw new ResourcePackException("Invalid UUID ($index)");
+				}
 				$this->uuidList[$index] = $newPack;
+				$this->resourcePacks[] = $newPack;
 
 				$keyPath = Path::join($this->path, $pack . ".key");
 				if(file_exists($keyPath)){
@@ -190,6 +196,11 @@ class ResourcePackManager{
 		$resourcePacks = [];
 		foreach($resourceStack as $pack){
 			$uuid = strtolower($pack->getPackId());
+			if(!Uuid::isValid($uuid)){
+				//TODO: we should use Uuid in ResourcePack interface directly but that would break BC
+				//for now we need to validate this here to make sure it doesn't cause crashes later on
+				throw new \InvalidArgumentException("Invalid resource pack UUID ($uuid)");
+			}
 			if(isset($uuidList[$uuid])){
 				throw new \InvalidArgumentException("Cannot load two resource pack with the same UUID ($uuid)");
 			}