I am trying to create crosshatch shadows but not as a post process, following this blog post https://www.tomlooman.com/disneyfaciliershadow/ but I am getting weird results.

I have forward rendering enabled and the material "works", sometimes. https://imgur.com/5cYvI3O

I am basically wondering if there's an alternative way of generating material's lighting map, or if someone knows why am I getting these weird "bugs" when using this method.