I'm honestly getting a bit disillusioned with Cast. I replaced all my Sonos with Nest speakers because of the better voice assistant functionality. "Fully supported" services like YouTube Music (that can be integrated as your default music service) work fine. But when I'm trying to use Plex or Tidal I run into issues if I try to include things like my Nest Hub in a group or dynamically add/remove speakers from what's playing.
Really? I have a CCwGTV hooked to my big audio system acting as one speaker and a Nest Audio as the other. I use them in a group as well as individually and I don't see any problems with audio over Spotify, YT Music or Plex. 🤔 Other than the occasional issue now and then.
The issue is with different Cast firmware versions. The Nest Audio is at 2.57 and my Nest Hub is at 1.71. The CCwGTV is likely kept up to date with the Nest Audio.