As I said, I've tried waiting around until more than 5 minutes have passed. And I don't mean, just rushing through killing everything and then waiting. I mean, just taking my time killing everything casually until 5+ minutes goes by. And yes, I've waited outside the main area, I've backtracked further than that too. I've went in and out of the boss doors, etc. Tried most things I could think of. Regardless, even if it does eventually work (likely not, in my case) it still needs to be fixed.