I don’t know about being able to “check” the save file, but I have noticed that single player can have issues with saving on PS. Typically you want to check the event log and see if whatever you did last shows up. As I understand with this particular bug, it can be recognized by whether or not the event log is updating. Try putting taking something that would show up on it like dropping an item and letting it decay. Also, my friend said that she quits to the main menu and hasn’t had it happen since the first few times we noticed it a while back when she was just closing the game directly.