I use Maya's Render Setup(similar to 3dsmax Scene Set) to set Ornatrix shape invisible, but cast shadow onto the face. So I can use it for composite purpose.

The problem is, when I use absolute override, and set the "primary visibility", it sometimes works, and sometimes not.

When I change the content of the "Collection", it sometimes not work anymore, and I have to delete the collection and redo.

So it is unstable. 

I am not sure this is ornatrix issue, but when I use box as a test object, it works.