I can confirm after update it is fixed. Nice to see Samsung providing a fix rather quickly.
I think you're right. I use Aquamail and I get notifications on my watch for all of my accounts with no issues. Even my Gmail accounts. I think the issue must be with the specific Gmail app for WearOSI think the GMail notification part needs to be fixed by Google. At least, I hope that is the case, because Sammy seems to be TRYING to stay on top of issues.
After the update I spent the day testing HRM with interval and continuous modes and everything looks good. I was hoping workout detection was fixed, but doesn't appear to be for me. Has anyone seen any progress there?