Hey there! Just wanted to add that in my case, when I try to render a Substrate SSS Material using the Path Tracing renderer, the Subsurface Scattering effect just stops working.
In the following screenshots (sorry - just follow the letters - I had to combine all the screenshots in a single image, because I am not allowed to post more than one), I have the same exact assets (same material and static mesh), when I switch the viewport to Lit mode - it renders SSS: screenshot B
Once I switch the viewport to render using Path Tracer, the effect is gone: screenshot A
Also did a quick test, and if I turn Substrate Materials OFF for this same project/same asset, and created a new PBR Material from scratch, that uses the SSSProfile shader model, the SSS effect works in both Lit and Path Tracer: screenshot C
