What I found out from using Graphene for longer now, ironically I often do not get notifications on the profile I have the messaging apps like Signal installed (eventhough I can see them contacting Signal server for updates and have notifications enabled).
But when I switch to another profile, those profiles will get a notification that I have received new Signal messages on the Signal profile.
I have yet to understand why other profiles seemingly are prioritized when receiving notifications or why it updates when switching. As if the switch process pushes through all the notifications that were waiting to be displayed.