Wyll has been bugged for my MP playthrough since we got Karlach in to the group.

He constantly has a ! above his head like he needs to chat, however we've exhausted all dialogue.
He never reacted to her being there either, and we've not been able to trigger the cutscene when Mizora shows up, and them resolving their differences/starting their friendship.
He has acknowledged that she is in camp though.

I've read that this had been patched but it's still happening. Have read up on a few work arounds to stop the ! from popping up but it also hasn't solved the issue.

Is he going to be bugged for the entire game? lol
mp just seems to be so buggy in comparison to solo play, as I've never experienced these issues.