Perhaps it was undone by the many cases of time travel... or even just an alternate universe, it's pretty commonly accepted that The Stand is part of the Stephen King connected timeline as an alternate universe, though once we start including alternate universes on here that don't follow the main overarching story (if you can even call it that - just giving a way to still validate the inclusion of those Evil Dead comics that just did whatever with the timeline TBH) you would end up with waaaaaaaaay too much content