What might be some reasons for a normal map to not work only on some objects?

I have a scene. The scene has GameObjects with MeshFilters and MeshRenderers. Many of these MeshRenderers use the same material. One of these materials uses the Default shader (Specular setup) and has a normal map set. On some of the objects, normal map works and looks nice. On some other objects, it’s as if no normal map was set. However, increasing the normal map multiplier in the material settings shows black spots. What could be causes of this?

Working surface:

Non-working surface:

Working surface (normal map multiplier in material set to 15):

Non-working surface (normal map multiplier in material set to 15):

Non-working surface normals (normal map multiplier in material set to 15):

Hm… Try to mess around with the tangent settings inside the mesh-importer settings.

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