Code hinting not working

I get no code hints for this code ( https://www.evernote.com/l/AALUb2sMnRRKpqJpoYffIlajRZ6Vf4vqS8o ):

$recipes = self::get_indexes('amd_zlrecipe_recipes');
       $post_ids = array_map(function ($recipe) {
           return $recipe->;
       }, $recipes); 

The PHPDoc for `get_indexes` is done properly and if I change it by removing `[]` after Recipe, for example, PHPStorm warns me:

/**
 *  Get Index
 * 
 * @global object $wpdb
 * @param String $extension_table_name
 * @return \ZRDN\Recipe[]
 */
public static function get_indexes($extension_table_name) {
    global $wpdb;
    $db_name = $wpdb->prefix . $extension_table_name;
    $selectStatement = "SELECT * FROM `{$db_name}`";
    $recipe_indexes = $wpdb->get_results($selectStatement);

    return $recipe_indexes;
}

Recipe is defined in the same file under same namespace:

class Recipe {
   /**
    * @var int
    */
   public $recipe_id;

   /**
    * @var int
    */
   public $post_id;
...

Any ideas what the issue might be?