more of a bug/feedback than a new idea

in the latest version of spotify, collaborative playlists can only have songs added via a invitation link (invite collaborators). 

this is fine with me (although i personally think users should be given an option on whether they want it to be either RESTRICTED/link only, or available to ANYONE ON SPOTIFY to add/remove songs).

however, now whenever i private a collaborative playlist then make it public again, all my collaborators are removed. the 'added by' section completely disappears/resets. it looks as though all the songs were added by only me. this is incredibly stupid and frustrating because my friends and i no longer know who added which song.