Casting shadows but not blocking light?

When I import this specific model, it seems to not block the light (from a directional light). In other words, it’s completely flat… even as I rotate it around, it does not have one side light and one side dark, like it should compared to a sphere for example.

Yet, when I set the directional light to cast shadows- then I do see those shadows, as though the 3d features of the model are stopping the light for the sake of shadow rendering, but not for the sake of the lighting itself.

Here’s a couple reference images to see what I mean:

The sphere is just a constant to see the directional light in action

The shader on the model is currently mobile-bumped diffuse, but the same problem is there when trying standard and some others.

Any ideas what is causing this and how to fix?

Thanks!

Are you sending in a normal map? Try setting the “Render Mode” to “important” to force it to light per-pixel.