Something strange happens is that when you defeat a faction (let's take the Comintern as an example), the member countries after the peace conference, start attacking each other, let's say. I had a game with the Axis, where I had defeated the USSR and its faction and after the treaty, those countries started attacking each other now that I was in my faction, I don't know if that can be fixed, I've also seen some other strange things with the AI but I won't talk about it.