Interesting hypothesis, I'll give it a try. Thanks for the input!

If you do actually have a 4-way (3 or more switches on one light) - put it back in the wall and go to one of the other switches on that circuit and open that up and hopefully see a typical 3-way...

I say 'mostly' because while I can call on each device explicitly by voice they will properly turn on/off, and using the Google Home UI I can turn them on and off. But I cannot say 'lights off' or...

I just went through this exact issue earlier today. I found a helpful FAQ but it didn't connect all the dots, so see if this helps: For a basic 3 way switch (only two switches) look on the old/dumb...