Yeah, bad autosave mechanics is a bit of a Larian staple at this point honestly. DOS2 had the same problem where I'd be having a blast going through the storyline, and my party would get killed only for me to realize the last time it auto saved was like an hour ago, forcing me to go back and redo all the things I had done, led me to stop playing the game for the rest of the day a few times. Unless they fix the autosave to save more often at some point, we're just gonna have to get used to manually saving all the time.