Seems like this really is a Sony problem... I've an Xperia XZ with the same issues. BT connects, can play music, but no metadata, and pause/play/skip/back functions not working in car. My other half has a Moto Z on Nougat where the controls work just fine in the same car. Same when I tested on my Samsung tablet also running Nougat. Really frustrating since my my phone (spotify) is my main source of music when I'm driving.
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