https://www.macworld.com/article/1669513/apple-music-bug-add-delete-playlists-library.html
Apple Music bug is syncing playlists with different users' libraries

Over the past few weeks, many Apple Music users have been seeing other
people's playlists among their own due to an increasingly widespread
Apple Music bug.

The Apple Music app has been arbitrarily deleting playlists in some users' accounts and adding other users' playlists into other accounts.

Once Apple Music accidentally sends the wrong playlists into someone's
library, it's deleted, which in turn syncs back to the original creator's account and deletes the playlist from there, too.

Depending on how the playlist was created, the action could also remove the songs from the user's library if they've opted to add them to their
library.

It's seemingly an issue with iCloud sync, though it raises some concerns
about a potential data leak. Playlists aren't sensitive data, of course,
but it could be part of a larger issue with Apple's cloud service.

There isn't much you can do to stop the bug other than turning off iCloud
Music Library, which will remove all Apple Music songs from your music
library.

The iOS Apple Music app doesn't allow you to download playlists for safekeeping, but you can export playlists with Apple Music on the Mac as an
XML file which can then be re-imported into Apple Music if it gets deleted.

Apple is releasing iOS 16.4 next week as well as a new music app, Apple
Music Classical, so it's possible that any issues are cleared up with the update.

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