Playlist Management

[TheDreadPirate]

Jellyfin writes the owner ID in the file, but also in the database. So your attempt to rename the new playlist to the old name conflicts with the ownership stored in the database for the old playlist.

Playlist ownership is new to 10.9. If playlists were created in 10.8 they are globally readable and, I think, writeable. New playlists can be globally readable, but I think only the owner can write to them.

I'd have to do some testing, but I believe that is how playlists work then and now.