Blender model turning black when scaled down in Unity

Question

I made a model in Blender, which I would like to import into Unity.

When importing into Blender, at full scale, the colours show up correctly :

However, I need to scale it down (the original model is very large). And when I do so, all the colours turn black. All of a sudden, once passed a seemingly arbitrary threshold :

I tried UV unwrapping in Blender, as well as fixing normals (inside and outside). But it doesn't fix this problem.

What could be the cause of this?

Answer 1

Please try to use 0.1(default) for Scale Factor on Import Settings of the Model.

If it doesn't work, how about changing the shader into Standard/Color? Maybe the issue comes from the shader can't handle the tiny scale because of floating-point precision.