I was able to cause this glitch to happen again in the new update It seems that happens when you go to remove a song from a playlist without editing the playlist you just swipe left on the song you wanna remove If you're not editing it This will cause your playlist to be like out of sync When you relaunch the app those songs that you removed if you didn't edit the playlist will be back and your playlist will be Sync again A possible fix you could do it is just make it so you can't remove songs from playlists unless you're editing a playlist I hope this helps someone fix this bug
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