So I completed the game once about 3 years ago. In my playthrough Jessica died because I failed one QTE prompt with Mike.
Fast Forward to today, I attempt another playthrough. This time having everyone survive and collecting the missing collectables.
Last chapter, I forget to pick up Hannah's Diary in the mines and because of that Josh died and the game saved. I thought to myself, "Ok, I messed up, let's reload the chapter". When I reloaded the chapter, it reloaded the progress of my first playthrough (with Jessica dead since lile chapter 2-3). I was mad at first but since it didn't autosave right away, I was able to resume my current run by quitting to the menu and booting up the game again.
Now I thought that, if I finished my run, since there was no way for me to go back, that the game would save this progress as the newer one and that I could restart at the last chapter and undo my mistake. But nope... the game only saves your very first playthrough...
I am so pissed off right now. I'll wait a week or two before going at it... again.