I think you meant “same thing”, but please correct me if I misinterpret. Unfortunately, my experience with streaming Wyze cameras in the Google Home app is also inconsistent, but viewing on Google Home Hub (also a television running Google TV and another television with a Chromecast HD connected) has been fairly reliable with a number of Wyze cameras.
Have you ever been able to view Cam v3 or Cam v4 via Google Home (either app or smart display), or is this a recent problem? I’m wondering if there’s any kind of service outage like what was reported in July (if you visit the link in the previous paragraph, you’ll see links to those topics in my other post), but I’m guessing that’s not the case here. What happens if you navigate into Cam v4’s settings and tap Reset Services? (I imagine Cam v3 has this option, as well, but I don’t own any of those.) I’m not expecting that to fix it; I’m just thinking of other things I’d try in your situation, and I’m running out of ideas.