https://news.ycombinator.com/newsguidelines.html
(I'm assuming, of course, that it wasn't the article title that got subsequently changed. If that was the case, ignore the above.)
Not the first time I've seen you say this. Would it be worthwhile to fetch articles when they're submitted, if only for your own sanity?
Probably not worth the effort on HN to try to automate vs just treating it case by case. It doesn't usually seem to be a problem. "Pre-optimization is the root of all evil" and all that.
Edit: or archive.org as dang says, but I don't know if even they see all versions of a page if there is a simultest situation. Regrettably seems pretty SOP on even reputable places.