A GAME BREAKING bug means the game is broken and unplayable. This bug is NEW, and I don't get how someone could've done it.
No, most games DO NOT in fact change how autosaves work Download 10 games off this site and tell me how many do, 9 or 10 of them won't have touched the saving(or honestly know how considering it's mostly russian/spanish shovelware)
And no, rollback doesn't work when you're at a navigation screen, or at least the house screen, so you cannot roll back beyond that, thus rollback doesn't work.
I work with this engine every day so unless you're the one fixing or causing the bugs stop running interference for a gamedev putting out broken content.