Spotify integration flawed

[ramob2]

I'm trying to play music via the Spotify Plugin for my Lyrian Music Server (LMS) over the Squeezer App. Playing single Tracks is generally possible. When I try to play tracks from a playlist I get a message in the lower part of the app telling me the song is not available and it starts playing a random track from the playlist.
I have the current version of the app and confirmed that the desired tracks are available on Spotify. I don't get the same behaviour from the web view of my LMS server.