Apple Music Smart Playlists do not work through Home Sharing
I created a smart playlist in Music on my M1 Mac Mini - it works fine, the songs in the list obey the rules in the smart playlist.
When I access Music with Home Sharing on my iPhone the smart playlist ignores all the rules - the list is everything in the library.
I've submitted this as a bug in https://www.apple.com/feedback/apple-music.html
Not holding my breath. This post is information for others that hit this problem.
Mac mini, macOS 11.4