Mesh changing color depending on rotation? [Help]

I made a mesh of text for a basketball court I’m working on, but for some reason when I rotate the mesh, it changes the color, but I need it to all be white.


How it should be

What it’s doing

Bumping, really need help with this asap.

I want to bump this topic because I have the same issue and have no clue how to fix it. Here is an example of the simplest 2-polygons mesh without textures rotated on different angles.

This color depends on the rotation of the mesh and is independent of the camera position.

What kind of a magic trick is that?

Here is the file with an issue
mesh-color-rotation.rbxl (56.1 KB)

This is a long standing issue with shadows affecting rotated meshparts incorrectly. I think if you set the collision fidelity of your meshpart to box, it should help?

Unfortunately, all options in MeshPart properties does no effect on this situation.

I got workaround solution from @MrOnlyKemal in the inbox. If I export this meshes to the OBJ and import them back then issue goes away.

On the left is the original situation. On the right is the import-export-import situation.