I'm trying the game after installing new patch and DLC, and the AI took a city with 1 pop from me without starting the fighting screen. Then I re-took it from them, also without a fight. The 1 pop was still there. No armies were inside the city territory though.

I didn't see this anywhere in the patch notes, is this a bug or intended behaviour? Has anyone else seen it? Cities with pop can now be conquered as if they had zero population?