I find that when I start a new game the autosave function continues to work correctly. As soon as I manually save a state the autosave function no longer continues. I'll continue to try with a new save but I haven't had any luck yet.
Same happened to me. Realized after almost 1.5 hours after my last save i had a game over and had to go all the way back. Guess i'll have to spam F5 just like the old games lol.