Unreal Engine Normal Map is not working at the parts of the mesh doesn't get a light. (For instance part of the mesh such as shadows.))

Development Asset Creation
1

I designed a tree log with blender and added a procedural materail and baked it. I exported it to Unreal Engine. At Unreal Engine normal map is working well at places that get lights but the normal map is a acting like it doesn’t exist at the places don’t get light. I flipped the green channel but it didn’t change anythink