I tweaked your scene a little bit which (i think) fixed your issue. As I see it, the issue was that the material blender was creating something like an “alpha effect” for super close objects (thats why my plane wasn’t visible, cause it was too far away). I changed the change range node so there are not total black areas and the “alpha effect” is not visible (or better barely visible). The blend color defines the visibility of the layer color.
I hope this fix works for you.
P.S. I am not uploading your textures, cause you already have them.
P.S. 2 I don’t know who made this material but it is super slow to render.