I should have linked this in my original post but this is related to a previous post I made asking whether transparent unlit substrate materials should use coverage weight for their opacity. It sounds like the answer is yes.
There are a couple things that cause confusion about this that might be worth revising. First, as I mention in that post, the Substrate documentation says:
Substrate Operators do not work with all Substrate BSDFs. Only Substrate Slab BSDF and Substrate Simple Clear Coat can use these Operator nodes.
This made me assume that unlit materials are supposed to achieve transparency through their transmission rather than use the Coverage Weight Operator. Does this note not apply to Coverage Weight?
Second, the built-in Substrate UE4 Unlit Shading material function under Substrate Building Blocks has an Opacity pin, but does not use Coverage Weight.
It sounds like this is incorrect.
Thanks for your time.