I've just started playing 7 Days for the first time in about a year. When I played previously almost every time you repaired or made a new tool it would upgrade, at least in the early stages of a new save game. I've been playing for about 6 hours and have crafted and repaired at least 20 stone axes. None of which have upgraded a single level. Is there a new system for tool and weapon upgrading with Alpha 18?