MouseEvent.MOUSE_UP not dispatched in a StageWebView

hello,

"stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp)" is not dispatched when I release the left mouse button in a StageWebView on Windows

package{
  import flash.text.TextField;
  import flash.events.Event;
  import flash.display.Sprite;
  import flash.events.MouseEvent;
  import flash.media.StageWebView;
  import flash.geom.Rectangle;
  
  public class Main extends Sprite {
    private var myTextField:TextField = new TextField();
    public function Main() {
      addEventListener(Event.ADDED_TO_STAGE, init);
    }
    private function init(event:Event):void {
      myTextField.border=true;
      myTextField.width=500;
      myTextField.height=50;
      addChild(myTextField);
      
      var webView:StageWebView = new StageWebView();
      webView.stage = this.stage;
      webView.viewPort = new Rectangle( 0, 210, 500, 200 );
      webView.loadURL( "https://www.google.com" );
      
      stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
    }
    private function onMouseUp(event:MouseEvent):void
    {
      myTextField.appendText("up");
    }
  }
}

MouseEvent.MOUSE_UP work if I release the left mouse button outside the air app but not in a StageWebView

MouseEvent.MOUSE_DOWN doesn't work too

Thanks