wall thickness does not get respected on partially filled bins

[avxmw]

Trying to make some partially filled boxes to cut shapes from I noticed they come out incredibly weak and I thought my printer is acting up, but it turns out, when you create a partially filled box (height internal >0, divx/y=0) all walls above the value of height internal are only a single line and not the defined d_wall (1.2 in my case).