It's nice that it will be possible to allow/disallow the notifications for specific mail accounts, though I expected that to be optional, and by default the notifications to be disabled globally for the app, but have an option to also set up a more fine grained focus filter if one has more specific needs.
Hope that is just a bug in the beta release as it's still in early stages. Or maybe your focus mode had the Allow time sensitive notifications enabled?
Thanks for sharing this, can't wait to see the final version.