Yes, I rebuilt that city in the turn after encountering the bug (since I only had 600 gold, which would have been enough to rebuild for 500, but not enough to rebuild for 900 as shown after the reloading).
SnotlinG wrote:It looks like your city has been rebuilt now though?
How did it get razed from the first time? Was it a self raze or was it razed by your opponent?
It was razed by my opponent, of course.

It lay in ruins - and hidden beneath the fog of war - for 2-3 turns.
My opponent razed 3 cities of mine. The first I rebuild right away, but it was never fogged. My capital, where I noticed the bug, was the second.
For the third, I noticed that the mouse over with the rebuild cost does not change if I scout the razed city.