Description of problem:
When notifications are set to "Off" and the lock screen is invoked, a notification will unblank the screen.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.From the pull-down menu from the top right corner, adjust the Notifications setting to Off.
2.From the same menu, select Lock.
3.Wait for a notification.
At 2, the screen blanks.
At 3, the screen unblanks.
The screen should remain blanked.
This seems to be fixed now, although I still have the same version of gnome-shell installed. Could have been one of: