Premium Family plan, LGV60, Pioneer WNEX4400 head unit, latest Android (as of Jan 2022), latest head unit BIOS, connects via WiFi-Direct.

My preferred music app is Stations and it has been working for more than a year (which is when I ditched Pandora and subscribed here). Starting about a week ago, when AA connects Spotify comes up instead of Stations. It's glitchy, sometimes it'll play the Stations content anyway, sometimes it hangs. If I select the Stations app from the AA menu, I see the Stations icon and UI flicker briefly, then it's back to Spotify. Most of the time it won't play anything at all.

Here and there I've been able to eventually get Stations to take over, but I'm not sure of the exact steps. Eventually I just uninstalled Spotify and at that point Stations always works, but since I'm paying for this, that isn't exactly acceptable.

As of today, my wife started experiencing the same problems in her vehicle (same model devices).

For whatever reason, Google Assistant settings doesn't even list Stations as a music player option, so I can't force the setting there. (I really wish they'd just add Stations functionality to the Spotify app, seems a bit silly to maintain two apps, and there's some crossover -- sometimes Spotify canned playlists show up in my Stations app -- but that's a gripe for another day.)