Spotify playlists silently not working

I enter this URI as a Spotify URI in the streams screen, and although it is a public playlist and works in my Spotify client (for Mac) it just says ‘Playing’ then nothing is added to the queue and nothing happens.

This seems to happen with a lot of playlists, but not some. I don’t see anything in the logs even if I start mopidy with debug flags -vv

spotify:user:21kdzclzzlz2a3ujyusgs6bja:playlist:5leYQG363A7o1L1ClGZLkG