The album artwork has always appeared for me streaming from my phone. USB always did also until Tesla broke it with the media update. But the phone artwork still appears but the USB no longer does. Has to be a simple fix.
Interesting. MCU1 or 2? I'm on MCU1 and every NEW song I tried today had album artwork (BT streaming from phone). Songs stored in my library that I played were about 50/50 although it was mainly my wife's music (that doesn't get played in my car, although we share the same 'library') that was showing album artwork seemingly 100% of the time.