lol. First rule of tech support: “have you restarted the device?” Have recently done exactly that, so if I never post here again I guess it was a simple fix!
@Snooj I think you are right, as it says 12 minutes ago. Unfortunately we can’t do much if it’s an OS issue, though we can investigate a little. If it comes down to OS our hands are tied. Sorry for the inconvenience. (It’s a good idea to ensure notifications for everything are on, and double check your settings for both home screen and lock screen in the meantime.)
A little anecdotal aside:
A friend sent me a text at about 1am on Monday morning.
My Samsung Galaxy S9+ didn’t register it as arriving until 3:26am! I also had a “Hurry back” alert at about the same time.
Throwing some thoughts into the void for those experiencing this problem to check:
Do you have game mode on? It will disable notifications.
Also found this article that explains some potential fixes. Hope this helps. A Complete Guide to Fixing Delayed Notifications on Android