Notification categories - restore

When I go to settings->apps & notifications->Gmail->notifications

It tells me in the bottom of the page that a notification category has been deleted !?

Does anyone know how to reset or set notification settings for an app to the defaults ?

I assumed delete/reinstall, but since Gmail is a system app on A10, it cannot be uninstalled, only rollback to factory version, and that doesn’t reset the notification settings…
IMG-20201220-WA0001

Surfed the topic a bit, and it seems app updates etc can do this.

So perhaps I need to ask in an other way. My issue is that Gmail makes it sound when I get a notification, but it doesn’t create a notification in the UL notification panel.

Does anyone know how to fix that ?