But please continue to speak to Roon in your support thread:
Obviously for you the update is causing the issue, but might there be an issue with how Google Mesh and Roon interact that you haven’t accounted for? Might it also help to report the issue to Google?
If you cannot reach a quick resolution (or just to test that 1.7 is still stable for you), although it won’t work on iOS devices (you say you have a iPhone) you can downgrade to 1.7 until it is no longer supported (or hopefully the issue you are experiencing is resolved):