Cover art missing on Spotify tracks

[anrefi]

I made playlists with local files that aren't available on Spotify and while the album art for them doesn't show on my phone (I read it was an issue on mobile app) when I downloaded the songs to my phone the art for the albums that ARE available stopped showing.

I figured out if I reset the app (and the local files aren't downloaded anymore) the art comes back but is there a solution to fix this without having to lose my other files?