Shader errors (macro redefinition) with VFX graph plugin

This has been bugging me since several days, when I add vfx graph to an empty project it works fine, no issues or anything, I can make vfx in scene and they all work corretly.
BUT. When I try to add it to an existing project, which has a couple of assets and none of them being shaders - just some models and textures, I get this error.
When I add textures/models (it's one folder) to an empty project with vfx graph then this error shows up again.
How do I fix this?