I get the feeling the AI didn't sort out its priorities before peace terms were sought after :rofl:
Im my Sweden game I did it twice: junior partner can't get coalitions (safe expansion). The main reason though was that I got a 1/1/4 and 5/0/1 kings. If you get back to PU you get a new chance in a better king. My third time I got 6/1/5 so definately worth it