You support the same music playback screen on iPhone, iPad, and CarPlay. When the app has been terminated and a scene reconnects, what would you restore the playing state from?
Save the current track id, the playback position in seconds, and the queue order with a version to disk instead of the screen objects, and when the scene reconnects, look the track up in the library again by that identifier and line the audio engine and the screen up with it.
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