I have upgraded from El Capitan to Sierra a couple of weeks ago. Today, I have been experimenting with widgets in Notification Centre and came across this puzzling issue. I am not sure whether it is a bug or intended behaviour hence I decided to ask a question and confirm.
This is what my Notification Centre looks now
As you can see, "Today" has no frame or border around it. However, when I try to edit widgets, it appears
Prior to me removing and adding "Today" widget, it had border/frame both, when displayed and when being edited.
Is this a bug in Sierra or intended behaviour?