In Linux player, the User column display the UUID of the owner instead of Nickname/Name.
1) Add a song to a shared playlist.
2) Open playlist, observe the User column.
3) After refresh (switch between playlists), users are displayed as expected.
PS: At this moment, the playlist has only 2 users (me and the owner) - this bug might affect other collaborators and not only the owner.
PS2: Link to playlist: https://open.spotify.com/user/217oiov6wfagtifmxbai7bvaa/playlist/47Fik0YTBF12VbeN30hTev