Forest Edge Map in CMasking_Mask element not working

[Bzuco]

It is possible to have forest edge map properly working in render elements?
I need B/W mask from some objects with concrete material for postproduction.
My settings in attachment

[Bzuco]

I found solution. It only works with properly render, not render elements only. So I set material for everything pure black(for grass + forest edge map), and add objects which I need adjust later in CMasking_mask element RGB list sections.