Normally a post shows the active time after first edit.
One post of mine does not show that information, does that indicate the post is not a normal state? If yes, what it is?
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The real mystery here is how nobody noticed that "active" timestamp has pretty much always only appeared on questions with at least one answer. :)
The original version of the sidebar back in 2008 included more stats about the answers, and that information was hidden for questions without any. Looks like over time, that gradually changed over to just hiding the last active date.
So, two things here:
Thanks for the report!
Update: we're going to show the last activity timestamp on all questions starting with the next production build (>
rev 2020.4.1.36451 here on Meta).