I'm experiencing the same exact problem. Looks like an account bug where the desktop app UI gets replaced with the shitty web version. I created another account and the desktop app displayed just fine. (Edit playlist descriptions, change playlist cover). Please fix this ASAP it's an account bug that the regular user has no way to fix.
Same.. My On Repeat Playlist also hasn't updated since they made me this new account 2 months ago. They transferred it over from my old account and it hasn't updated since. Still, I got back the sorting methods, queue, playlist editing and friends activity so I am not f*ed to try to do anything about it. Trying to get help from Spotify is like talking to a brick wall.