Forum Discussion
You repeatedly "face" the boss in the solo section, and before the actual boss fight proper there are multiple challenging encounters that would be near-impossible solo. Therefore I'm reading it as Cheeseboard still being in the earlier section. I could be wrong of course, but of the bugs I've seen reported - and as you can imagine I see quite a variety - there's not been much in the way of failed solo > party section transitions.
tktailo,do you have the quest as active on your tracker? There should be a steadily-decreasing bar indicating your remaining time. If you check your journal, can you toggle the quest on as your main one? If you load an earlier save does the quest indicator then show up? Ideally load one from late in the Fade section.