Let's say, "theoretically", somebody gets off a cruise ship in Beijing (Tianjin) and fails to notice that their Visa expires at Midnight. They now have only an expired visa. They are now 'stuck' in Bejing amd can't reboard the ship. Could they still be able to request a 72-hour Visa on Arrival (and where would they go for this since they are now in China illegally), or is there another course of action they should follow.
Interesting problem.