In my jianzhou game i have formed Manchu and currently am allied to korchin and we are at war with Korea. Korea had Manchu separatists fire that are considered allied rebels but they spawned on top of korchin while they were sieging a province so korchin instantly killed our allies. This seems like something that shouldn't happen. If separatists spawn that are for a country that you are allied with in a war against the rebel origin country they shouldn't be your enemy at that point right?