We're seeing the same issue on our app as well, and first noticed that this was broken in September 2021. The behaviour has changed slightly a few times over the last 9 months, but it's still broken: currently, provisional notifications don't appear in the Notification Centre until you interact with a notification from a different app; when they do eventually appear, tapping the 'Keep' and 'Deliver Immediately' buttons doesn't change the status in Settings, only in our app.
I've seen another report of this happening here too: https://support.airship.com/hc/en-us/community/posts/4408631827739-Problem-with-provisional-push-notifications-in-iOS#:~:text=Looks%20like%20a%20bug%20in%20iOS%2015%2C%20I%20have%20reported%20it%20to%20Apple.
