There are other threads talking about the same issue and a bug ticket
was issued. I also created a support ticket
yesterday.https://www.googlenestcommunity.com/t5/Chromecast/Google-assistant-voice-search-not-working/m-p/550220
I opened a support ticket w/ google yesterday and described the issue.
Their technician said I was the first to report anything. Lets see if
they find a fix.