No music player in Notification Center/Lockscreen after playing video

[quiKsilverItaly]

My app plays video and audio. I start fullscreen videos like this:

    func startFullscreenVideo(videoURL:URL) {
        
        let player = AVPlayer(url: videoURL)
        
        let controller = AVPlayerViewController()
        controller.player = player
        
        present(controller, animated: true) {
            player.play()
            
        }
    }

and the Audio with your library.

Problem: After playing Audio, then playing a Video, and then playing Audio again the App stops to show a Music Player in Background/Lock Screen/Control Center (https://i.stack.imgur.com/zXRw2.jpg this one starts missing).

This is a weird bug and I hope you can help me.