Do you have the actual app open whilst driving? If not, it's doubtful it will update at all, or at best intermittently.Ah, that makes more sense. Unfortunately mine is not updating yet, even while driving.
I have tested it and there is no question when you open another media app the previous one closes. I've not actually kept running this app while driving because I didn't want to hear all that ice noiseMaybe you could get away with it if it's the only media app - so the 'last launched' one for example, but as soon as you switch to Spotify, I'd expect the other one to stop responding.