Apple Music folders

Hi! I use the Apple Music folders feature quite a lot and when I updated to IOS 18, all the playlists that was in folders duplicated onto my main library and when I edited any playlist (one in a folder or not) it change the other. I can’t use folders anymore as anyone I add a playlist into a folder, it just duplicate this only my main library. I’ve tried deleting the app and signing out of iCloud but non of this works, anyone had this issue before and if so, how did you fix it?

many thanks