The question Why is bash history substitution still enabled by default? was closed at 2018-04-09-21:59:11Z. Ten minutes later, at 22:09:25Z a (perfectly reasonable) answer was posted by Jason Goemaat.
How was this possible? The question's timeline also shows the events in this order:
I first saw the answer when it appeared in the active questions list as "posted 7 seconds ago" to an "[on hold]" question. I thought it had been lucky to have barely made it in under the wire, but in fact the question had long been closed by then. I haven't seen this before and it seems either to be either a bug, or that I don't understand how question closure works.