That's a really weird behavior. Unfortunately, I have no other idea than to wait for a newer update or for an official standalone 1.0.1 update. The one within XCI doesn't work properly for whatever reason. Thankfully, you can still play the game if you remove the update so there's that.
the dlc also works it's really with the update that it stops working either its the update which is buggy or its a patch to be done and which doesn't exist yet