Well the airline will not let you board when you donīt match the rules for the 24h.
In the scenario the traveler describes. The airline made an error and allowed
the travelers to board and be flown to china with an itinerary which doesn't comply with TWOV rules. They got to China and were denied entry. The question is, if a traveler arrives to China with an itinerary that does not meet the rules...will immigration offer them a chance to change their itinerary to comply or immediately deny entry with no attempt to mitigate the situation?