Hi,
Thanks for posting in Q&A platform.
I didn't find any official document indicates that DNS resolver priority has changed in 20H2 version. Actually, I have test in my lab with a device with 2 ethernet adapters, the DNS resolver's priority is still determined by the interface metric.
Please understand, due to the environmental limitation, we have no such WiFi device to test in our lab. It is hard for us to reproduce and analyze this issue from Q&A platform support level.
If your issue is urgent, I would suggest you open a case with Microsoft where more in-depth investigation can be done so that you would get a more satisfying explanation and solution to this issue.
You may find phone number for your region accordingly from the link below:
https://support.microsoft.com/en-us/gp/customer-service-phone-numbers
Best Regards,
Sunny
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