If no one knows, guessing would be appreciated as well. Or maybe a link to some useful documentation.

We have a similar problem. After adding the AssociatedBundleIdentifiers to the LaunchDaemons' plist files they are at least labeled with the developer name instead as before with something completely unrelated. Then we tried to start the app in the postinstall before loading the LaunchDaemons. Now one item has the name of the app, the other one has still the developer name. It seems the notification banners appear when starting the app, not when loading the LaunchDaemons. Is that possible?