I had a Core World named Alderan I for which I had built a shipyard named Alderan Shipyard I.  Life was good.  Then Alderan I was successfully invaded by another civilization.  I then successfully reconquered Alderan I and tried to assign Alderan I as the sponsoring Core World for Alderan Shipyard I.  In previous versions I was able to go to the Manage Shipyard screen and assign a Core World as the sponsor for the shipyard, but that ability seems to be gone.  Am I missing how to assign a shipyard to a Core World?

Screen snapshot 1 below shows that Alderan I belongs to me (Mimot Brotherhood) and that it is a core world.

Screen snapshot 2 below shows that Alderan Shipyard I also belongs to me.

Screen snapshot 3 below shows the shipyard management screen for Alderan Shipyard I which shows that it does not have a sponsor and does not have a way that I can see to assign one.  If memory serves me correctly, there used to be a button at the bottom left to do this.