Interesting thing I discovered...
When using Bluetooth on my phone (i.e. not plugged in), if I'm listening to my own MP3's (Oneplus 9 pro and MusicOLet app, for reference), I always get the album art (if available) one the media screen, unless it connects when I'm in the middle of a song, then I get no album art for that song, but the next song and subsequent songs I get the album art.
However...
If I'm listening to Pandora, I don't get any album art
unless it connects in the middle of a song, and once the new song starts...no album art for any songs--like completely reversed of normal in-phone MP3's
Plugged in
Android Auto makes the whole situation moot, but for short trips without the need for any GPS I usually don't bother plugging my phone in.
And yes, all of the phone/app settings have it push album art over bluetooth.
Very minor thing, but I find it odd the the behavior is completely reversed. I don't think it's the phone because my last car had an
aftermarket head unit which pulled the album art regardless.