I do have four ZW4SF in my mesh. Also using Hubitat's native Google Home integration.
I am using @Vyrolan's modified version of @erniemiller's ZW4SF driver . With the Hubitat Google Home integration updates in 2.3.9.192, the driver "just works" for me now without any modification. I did have some issues with the driver and GH prior to 2.3.9.192.
Edit 1:
The 2.3.9.192 Google Home integration update expects drivers to implement required functionality. For capability "FanControl" that includes among other things having supportedFanSpeeds populated. There are a lot of fan (and I'm sure other types) drivers out there not in compliance with Hubitat's Driver Capabilities documentation.
I have suggested to the Hubitat crew that they implement null safe checks in the Google Home integration for driver required functionality to mimic past behavior. Not sure if they will accept my recommendation in any future update.
Edit 2:
In the alternative to implementation of null safe checks and letting bad drivers through as in the past, they could detect and better report in the logs what the failure is, eg: driver xxx is missing required attribute supportedFanSpeeds. And even if a driver cannot be accepted, just skip over the bad device and process the rest as expected.
It’s an engineering philosophy that technology should work even when it fails. Example: a failed escalator still properly functions as stairs to get you up or down a floor,