The deformation constraints strength were too strong and they were
preventing the cloth effects of the brushes with cloth deformation target
to create folds properly. This lowers the default, making the simulation
follow the deformation in a more relaxed way.
I'll make a separate patch to expose this as a property for certain brushes
and cloth deformers that may need higher values (like boundary with loop
falloff on a low poly mesh), but I think this default will work better for
most use cases.
I'm using the scale cloth filter, not in master yet (D8661)