Normals Disable Smooth Shading? I'm having an issue that whenever I input a normal map into a shader normal node in blender 2.9 it disables smoothing for that object and the polygon face edges become visible in the render.

Any idea why?
Here's a question: which is more high-res, your object, or the normal map? If the object is more high-res, than the normal map is going to hide that with it's low-res faces.