Notification problems in lock screen – Messenger Review

I have been having notification problems with the messenger app in the lock screen of my iPhone for at least a week now. Whenever I receive a new message in the lock screen, it briefly appears for a split second then it will disappear from the lock screen. I tried updating the app which I thought would fix it and I even tried reinstalling the app but the problem is still not fixed. I hope Facebook can fix this issue quickly because this is annoying and i won't always know if I get a new message if it does not stay in the lock screen.
Review by Windwheel on Messenger.