I have the same problem, can't add my Sony Bravia to a speaker group and
i can't control the TV via my Nest hub. It always replies that the TV is
not responding. I hope this gets fixed soon.
I have the same problem with my Sony Bravia with chromecast built-in. It
does not show up if I want to create a new speaker group and i can't
cast Spotify simultaneously on my Nest Hub an the TV. Would be nice if
this will be solved with the next upd...