Maybe this just arises from the simplified diplomacy of this version. But I had some very strange events when my sovereign and his army was attacking a neighboring city. It looked like another (third AI player) beat me to conquering the city by just 1 turn, but the control of the surrounding area had not changed completely. To enter the area I had to declare war on both opposing factions, then attacked and took control of the city.

An opposing sovereign was in the city but did not take part in the battle (perhaps because her combat factor was 0, or another bug?). But after the battle that sovereign was still in the city and looked like belonging to my faction. But I could not move it. Maybe it was captured, or part of the bug? Can't figure out what happened. If it would be any help I have savegames before and after the situation.

Really enjoy playing already alhough a lot of things are obviously strange or missing. If development goes in the direction I'm guessing, this will be a great game!