When you say “local” I assume you mean my MacOS laptop? The library shows all my followed artists, some playlists, and a few hundred albums. None are downloaded though. I only use TIDAL, I don’t have any physical files on my Plex server or laptop.
I think this is a bug.
Plexamp was not really tested with your use case, because it is not very useful for someone without a local music library. When compared to the native Tidal app.
I sure hope this feature will not be dependent on Tidal soon. I have an extensive server library because I don’t want to pay for cloud-based streaming services. I curate out of print Jazz that doesn’t appear very often on services catering to a young mainstream audience.
Sonic Stage works great so far. Right now I’m on the OpenAI API Free Key Trial but will probably pay for it when it expires , if the playlists keep being these good.