Thank you so much for quick reply! I've added new object with new script which I made earlier. What I noticed is that on the opening, where you see main menu and camera looking at bench, it's black. It's normal again if I delete my object. NEW GAME won't load game at all (loading screen forever). Console says nothing (no errors).
Script is like this: give item -> detach object (self), it's named "pick_up_item".
Later I made object and just selected this script file in properties. That's all. I have no idea what's wrong...