I have 3 TVs in my home and Google branded speakers in the same room, which are linked to the TVs in the same room. So if I say "hey Google, turn off my TV" if I'm in my bedroom it turns off my bedroom TV, if I'm in the livingroom, the livingroom TV turns off.
Since installing my Sonos Beam and activating Google assistant the "turn off my TV" command defaults to the "Sonos TV connection" even if I'm not in the room with the Sonos speaker. My bedroom speaker no longer turns off my bedroom TV, it turns off the TV the Sonos is connected to.
I've checked the settings all speakers are still linked to the correct TVs. I have no idea why it's defaulting to the Sonos connected TV for all speakers.
I can of course say the longer "turn off the livingroom TV" but kinda spoils the smartness of the speakers knowing where I am.