Normal game, no mods.
So. When you force vassalize a nation, and that nation happens to be in a war with someone else, you are transfered leadership, as usual. Now the fundamental issue here that came with 1.4 is that it breaks all your existing alliances and gives you a Dishonored Alliance CB against all of them. For a war they couldn't have joined. Really screwed up, this ruined one of my games where I was relying on alliances to keep me alive.
So. When you force vassalize a nation, and that nation happens to be in a war with someone else, you are transfered leadership, as usual. Now the fundamental issue here that came with 1.4 is that it breaks all your existing alliances and gives you a Dishonored Alliance CB against all of them. For a war they couldn't have joined. Really screwed up, this ruined one of my games where I was relying on alliances to keep me alive.