Like the previous revisiting puzzle, the expiration time on this one is 5 hours later than normal. It's set to expire at 23:00 UTC/GMT, where revisiting puzzles normally expire at 18:00 UTC/GMT.
Puzzle 1813: Revisiting Puzzle 97: Pig was set up the same way, but actually expired at 18:00 UTC, the customary time.
Don't count on the five extra hours! (Sad experience here.)