I'm trying to switch from using the URP/Lit shader to a custom one created with the shader graph in a big project with hundreds of materials. Most of the materials have just a _BaseColor texture referenced and I'm trying to set up my shader graph property so that the texture reference is maintained when I switch from the lit shader unity provides to my new one. No matter what I do, the reference is lost when changing to my new shader. Is this possible? What name does the base color property need to get this to work?