I updated Factorio and Factorissimo2, built an underground belt, tried to rotate it, and the game crashes with this notice:
Error while running event Factorissimo2::on_player_rotated_entity (ID 19)
LuaEntity doesn't contain key 1.
stack traceback:
Factorissimo2/control.lua:1060: in function <Factorissimo2/control.lua:1051>