When I go to Settings, Mobile Data the page keeps refreshing so that I cannot scroll down to turn off or on a button for any particular app that I want to either use or not use my mobile data.
Update: just reverted to 11.4.1 and my mobile data is behaving itself. Odd that I can’t see any other reports of this... I was using the Apple SIM on my iPad Pro 10.5 with a payg EE account.