Hello, I've recently come across a bug in the Dawnguard DLC quest "Touching the Sky." In which I have to "Confront Vythur." When you approach him, a dialogue between him and Serana should start. But when I go into the room, nothing happens. The dialogue won't begin. I have no idea why this is happening, and I have the Unofficial Patches installed, so any help would be greatly appreciated because I can't progress in the DLC.

Thank you in advance!