Earlier quoted context omitted.
Similar thing would happen in my Toyota, the song 'Afraid' by Yellowcard would play every time I turned on the car. Realized it was playing the first song in my library. In Apple Music there is a song called 'A a a a a Very Good Song (Silent Track)' by artist Samir Mezrahi, that contains 10 minutes of silence. I added that to my library and now that song plays when I turn on my car (although this autoplay only happen…
But why the hell is it autoplaying in the first place? Does apple really hate their customers/users so much that they can't make this an option? That's completely insane. The more I learn about apple, the more I see extremely hostile UI decisions for literally no reason
That said, I have had this issue when connecting an iPhone to a '11 truck via USB. It tries to treat it like an iPod, and consume its default playlist (all songs in Music, sans shuffle).
So this is probably the bluetooth equivalent being done by the cars - treat it like an iPod that the entertainment center should be in charge of.