Finally a survival game implements real crouching! (As far as I know lol).
Been having a bug with scaffold since about 0.9.2. Sometimes scaffold forgets it's supposed to be solid. Tried stacking many layers of scaffold thinking "how likely will all of them go not solid at the same time?".
Pretty likely it seems. Scaffold has become such a death hazard during high rise construction I've had to switch to using blocks and ladders.