diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index f52f5199c..0afe2eecb 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -1035,13 +1035,17 @@ class Server{
 
 		$path = $this->getDataPath() . "worlds/" . $name . "/";
 
-		$providerClass = LevelProviderManager::getProvider($path);
-
-		if($providerClass === null){
-			$this->logger->error($this->getLanguage()->translateString("pocketmine.level.loadError", [$name, "Cannot identify format of world"]));
-
+		$providers = LevelProviderManager::getMatchingProviders($path);
+		if(count($providers) !== 1){
+			$this->logger->error($this->language->translateString("pocketmine.level.loadError", [
+				$name,
+				empty($providers) ?
+					$this->language->translateString("pocketmine.level.unknownFormat") :
+					$this->language->translateString("pocketmine.level.ambiguousFormat", [implode(", ", array_keys($providers))])
+			]));
 			return false;
 		}
+		$providerClass = array_shift($providers);
 
 		/** @see LevelProvider::__construct() */
 		$level = new Level($this, $name, new $providerClass($path));
diff --git a/src/pocketmine/lang/locale b/src/pocketmine/lang/locale
index 7f12f293b..e738dc7ca 160000
--- a/src/pocketmine/lang/locale
+++ b/src/pocketmine/lang/locale
@@ -1 +1 @@
-Subproject commit 7f12f293bfad76e5c07b929c893e848728064977
+Subproject commit e738dc7ca0171a1a16e3682fc2a7619c059988b9
diff --git a/src/pocketmine/level/format/io/LevelProviderManager.php b/src/pocketmine/level/format/io/LevelProviderManager.php
index 75291a75a..0d3a3b3d9 100644
--- a/src/pocketmine/level/format/io/LevelProviderManager.php
+++ b/src/pocketmine/level/format/io/LevelProviderManager.php
@@ -87,17 +87,17 @@ abstract class LevelProviderManager{
 	 *
 	 * @param string $path
 	 *
-	 * @return string|null
+	 * @return string[]|LevelProvider[]
 	 */
-	public static function getProvider(string $path){
-		foreach(self::$providers as $provider){
-			/** @var $provider LevelProvider */
+	public static function getMatchingProviders(string $path) : array{
+		$result = [];
+		foreach(self::$providers as $alias => $provider){
+			/** @var LevelProvider|string $provider */
 			if($provider::isValid($path)){
-				return $provider;
+				$result[$alias] = $provider;
 			}
 		}
-
-		return null;
+		return $result;
 	}
 
 	/**
diff --git a/src/pocketmine/level/format/io/region/RegionLevelProvider.php b/src/pocketmine/level/format/io/region/RegionLevelProvider.php
index 43751c069..fad5ff3eb 100644
--- a/src/pocketmine/level/format/io/region/RegionLevelProvider.php
+++ b/src/pocketmine/level/format/io/region/RegionLevelProvider.php
@@ -45,23 +45,16 @@ abstract class RegionLevelProvider extends BaseLevelProvider{
 	abstract protected static function getPcWorldFormatVersion() : int;
 
 	public static function isValid(string $path) : bool{
-		$isValid = (file_exists($path . "/level.dat") and is_dir($path . "/region/"));
-
-		if($isValid){
-			$files = array_filter(scandir($path . "/region/", SCANDIR_SORT_NONE), function($file){
-				return substr($file, strrpos($file, ".") + 1, 2) === "mc"; //region file
-			});
-
-			$ext = static::getRegionFileExtension();
-			foreach($files as $f){
-				if(substr($f, strrpos($f, ".") + 1) !== $ext){
-					$isValid = false;
-					break;
+		if(file_exists($path . "/level.dat") and is_dir($path . "/region/")){
+			foreach(scandir($path . "/region/", SCANDIR_SORT_NONE) as $file){
+				if(substr($file, strrpos($file, ".") + 1) === static::getRegionFileExtension()){
+					//we don't care if other region types exist, we only care if this format is possible
+					return true;
 				}
 			}
 		}
 
-		return $isValid;
+		return false;
 	}
 
 	public static function generate(string $path, string $name, int $seed, string $generator, array $options = []){