I am no longer able to clear notification center sections in this manner.
Incorrect Labels for "Clear Section" Buttons in Notification Center
On the “All” tab of the Notification Center, the "Clear Section" buttons are announced as "Confirm Clear Section", even if you have not activated them.
Bug First Encountered
Device(s) bug has been encountered on
How often the bug occurs
A one-finger triple tap on the button will clear the section. Alternatively, you can do a one-finger double tap twice on the button to clear the section.