I know, diplomacy is supposed to be disabled in beta 2A. But there still a way to have access to that screen for making arranged marriage. I have married some of my sovereign's daughters to the Pariden. Then I have notice a strange beahvior with the Empire Tree:

Oanespray, capitar princess has been married to Pariden. This is shown with her info card displayed on the bottom right of the screen. the problem is that I have accessed to this infocard by moving my mouse on the empire tree entry below my sovereign. It was normal to have her there when she was with Capitar colors. But it us very strange to have her still here now that she wears Pariden colors .....