ShaderForge 1.36 fails to compile shader which LERPs normals. It attempts to use partZ before it is declared in code.

Ah, this is because depth is always defined after normals, for some reason. In the meantime, you can probably do worldPos-cameraPos as a substitute for depth, for now. I'll see if I can get this fixed in the next version

Thanks for the quick response and solution! Very much appreciated.