Registry pattern in PHP for create class

I have a pattern to create class and hold in array to return existing instanced class in future use.

abstract class Models extends Factory {
    public static function getPlaces($dbConfigName = "my") {
        return parent::getClass($dbConfigName, 'Places');
    }
    public static function getCategories($dbConfigName = "mo") {
        return parent::getClass($dbConfigName, 'Categories');
    }
}

And another:

abstract class Factory {
    protected static $classes = [];
    protected static function getClass($dbConfigName, $model) {
        $config = Config::getConfiguration($dbConfigName);
        $namespace = "App\\Models\\{$config['driver']}\\{$model}";
        $key = $dbConfigName.$namespace;
        if (!array_key_exists($key, self::$classes)) {
            self::$classes[$key] = new $namespace($config);
            $test = self::$classes[$key];
        }
        return self::$classes[$key];
    }
}

The class created with the name of Catogires successfull in first call this function:

$categories = Models::getCategories();

and inside of this categories class i want to create another class to use:

$categoryFields = Models::getPlaces();

Bu the above code inside of Categories class create again Categories instead of Places class. In my test with reflection and print the namespace before create class is this:

***** This is for create Categories class for first time*****
New: App\Models\MySQL\Categories

ReflectionClass Object
(
    [name] => App\Models\MySQL\Categories
)

***** This is for create Places class inside of categories class *****
New: App\Models\MySQL\Places

ReflectionClass Object
(
    [name] => App\Models\MySQL\Categories
)