you could try scraping the event as a last resort, Idk if it'll fix kerfur though. To do it you type "debug scrape" in console
Viewing post in Voices of the Void 0.8.2 Bug Reports
I had heard that as well but i had the large white wisp event that makes it extremely foggy once when i was trying to run around and do a bunch of stuff, not wanting to deal with it i scraped it just to see what would happen. It turned instantly sunny and the wisp was gone. Maybe it was just perfect timing though, lol