The following occured in a multiplayer match. I attacked an AI alliance and a human player joined on my side. This human player besieged and occupied provinces of a minor warparty. He was not allowed to negotiate a separate peace with this minor party, but I was. So I made a separate peace in which my human ally vassalized this minor warparty. And the thing is, he did NOT receive any aggressive expansion penalty despite the pop-up saying so. We tested this multiple times; is it supposed to be like this because he wasn't the one "being aggressive" or is it a bug?