In test44, a couple of turns ago I razed a city. Last turn my bat finished his move on the razed city. When I started this turn the city was still razed. However after moving my bat and reloading the game/browser, the city is rebuilt!
It's a neutral city now with no units. Clicking on it shows ? for the income/wall levels. It's the city located down on the bottom right by black if you want to take a look (I didn't end my turn). I've reloaded a few times and it continues to show the city as rebuilt.
KGB