[bug] The last turn in Castle siege

Not sure whether somebody has reported this or not. Here it is:

During a castle siege (player as the invader), the AI usually choose to storm out of the castle in the last round. A simple approach is to fight and defeat the AI. However, just now I chose to "exit the battle", and the result of this battle is a draw with 0 man die on both sides.

However, the turn comes and the city is under my disposal. Without a single man losss we got a big city. I think this is quite wrong (although quite happy ~;) )

Sounds like it´s not a bug.
If the battle was a draw I guess you´re troops got back to besieging the city and the enemies went back into the city(never had a draw myself, we either win or die ~D ).
Because the city had only enough food for one more round, next round the garrison will die of hunger as usual, I guess.