Material Function with Deferred Decals

Hi everyone.

So I'm having a small problem with using Material Functions with Deferred Decals.

Here is my material function for a white plastic.


Here is the setup that does not work. When I apply this to my decal nothing appears. It's odd because it looks good in the previewer.


Here is the setup that does work. When I apply this to the decal (same settings as before), it does work. The only difference apparent to me is that one uses a material function and the other uses the textures outside of a material function.