getQualifiedDefinitionNames Porblem

I have a problem with getQualifiedDefinitionNames, when I compile with AIR 20 I get

Main gameBg_png$c19135a2672bad8837da970f47c7278f-30390368

and when I compile with Apach Flex 4.15.0 or Adobe Animate CC it returnes everything as expected!

Main Main__gamebg

how to fix it with AIR, that it returned Main__gamebg class?

my sample code:

package{
  import flash.display.MovieClip;
  import flash.events.Event;

  public class Main extends MovieClip {

  [Embed(source="../assets/gameBg.png")]

  public const _gamebg:Class;

  public function Main() {
     super();
     if (stage) init();
     else addEventListener(Event.ADDED_TO_STAGE, init);
  }

  private function init(e:Event = null):void {

     removeEventListener(Event.ADDED_TO_STAGE, init);

    var definitions:*;
    if (this.loaderInfo.applicationDomain.hasOwnProperty("getQualifiedDefinitionNames")) {
         definitions = this.loaderInfo.applicationDomain["getQualifiedDefinitionNames"]();
         for (var i:int = 0; i < definitions.length; i++) {
             trace(definitions)
         }
       }
     }
  }
}