Clothing tool, Config does not have any effect

I’m trying out new Clothing Tool, and I got it to work, but it seems as no settings in Config (Clothing Properties) have any effect on simulation. Except for Damping.

I’m trying to make my cloth very stiff, but it bends and crumbles always in the same way. I tried all possible values for all stiffness parameters, 0, 0.0001, 1, 10, 100, 9999999999 and random values in between, it looks as if they are just ignored.

Am I doing something wrong? Or is it a bug?

I see the same issues happening to me. This seems to still be a problem on 4.20