Still unfixed, see:
https://www.googlenestcommunity.com/t5/Chromecast/Cannot-Group-Cast-Youtube-Music-when-Chromecast-With-Google-TV/m-p/306798Google
please take this more seriously.
I have the new preview version and can tell you it doesn't solve the
issue. Also quite disappointing overall in terms of controls. And most
glaring miss is the still completely broken volume control due to Google
not willing to pay Sonos and making u...
Exactly same issue here with brand new Google Nest Audio, Google N'est
Wifi and GCWGTV. Google please fix this bug. I am on the beta Google
Home app and it isn't better.