Since 2.1 I've found several times that if I shift-click a name in chat to /who them while a census is running, it comes up with "0 players found" - can't really see why, as nothing looks different in the results when I do it without a census running, and when I've tried a manual /who with census running it works, just not the shift-click with census running
And even more strangely if I manually /who someone with census running and
then shift-click who them with it still running, it works... got no idea what's going on there!