Device: iPhone 7+
Operating System: iOS 12
Spotify no longer displays anything in my CarPlay. It's just a blank, black screen without audio controls or anything. The CarPlay navigation in the left sidebar is still available and I can switch to other apps which all seem to work, but Spotify is just blank. Must be an iOS 12 issue because it worked fine before that.
I posted about this in the Carplay subreddit as well and I was not the only one experiencing this so it doesn't appear to be a problem unique to my phone.