Had a game totally derailed because the claim throne CB just didn't give me the CB on the target, but sure gave me all of the antagonism associated with it.

Playing as Hungary, Poland somehow broke free from a PU I had with them despite no notification that it would happen, once we went to war I selected the peace option to install my ruler on their throne and it just... didn't do that. In fact, it gave me the antagonism and entire European coalition associated with it, but not the union itself.

Womp womp, that's what I get for upgrading to a beta in the middle of a playthrough, and playing a beta in general. 10/10 gonna go play France next because they ate a fourth of Europe by 1500 seemingly totally unchecked.