My Question or Issue
I know this is like yelling into an echo chamber as nothing ever comes of these bug reports. We Linux users are basically just talking to ourselves. But here goes...
Recently the cover art url (mpris:artUrl) in the metadata leads to a dead end. The url itself is not malformed it just doesn't lead to anything but a file not found error.
As a side note, best practice for cover art is to cache it locally at least for the session and send the cached file url to MPRIS not only does that make covers load faster but it also cuts down on network traffic.
If all you're going to add is boilerplate advice to delete some folders and reinstall Spotify just don't... Maybe try actually fixing your software and/or CDN...
I would be ashamed of the state of the Spotify desktop app if I were you...