u/Cardioid123

I have this model that I'm turning into a sponge. I have a main material and a second material that I want to give a slightly different texture. I've cut out these holes in geometry nodes but the cuts each have the main material on the inside rather than the material of the face that's been cut into. How do I get the insides of the cuts to have the correct material?

I'm following along the tutorials for V-Ray in Blender on the Chaos website but I've hit a snag. The first picture is what the icing is supposed to look like and the 2nd picture is what I'm getting. The icing on the left just doesn't show any materials at all.

I've tried making crazy changes to the roughness, the diffuse color, the sheen, the translucency and nothing happens. I tried using one of Chaos' materials to test it out and it doesn't show any change but it does on the icing on the right. Does anyone know what's going on here?