I have tried many different solutions (clearing cache, relogging, restarting my computer, logging out of all sessions).
I have multiple playlists and this happens with all of them including liked songs. Small and big playlists. Albums too.
If I click on a song and click "repeat", the repeat button will flash for a moment before setting itself to repeat. If I click on another song or click on the playlist again, it does not save the designated "repeat" that was there before like it used to.
When double clicking on the playlist, it "shuffles" to a "random" song. I do not have automix on, this is not a case of it just playing similar songs, it's the exact same queue every time. It will shuffle to a random song, and if I double click again, it will go to the same song with the same next-up. If I turn off shuffle, and then click the playlist, instead of playing the first song, it will still play the song it previously chose.
If I click to go to the next song, it will now only shuffle from those two songs.
I like to double click playlists to shuffle them, but this has made that function unusable.
This is on the PC app.
I have premium, if that matters.