GridMap cell becomes unshaded when is rotated

[korke_0]

Godot Version

4.5.1

Question

Okay I tried to import some Godot 3.5.1 mesh in Godot 4.5.1 and use in GridMap, after fixing the texture path issue, everything seems to be working pretty normally except the shadow doesn’t work when rotated.

Any suggestions what I should try?

[korke_0]

Interestingly when rotating the Directional light on the Y-Axis the unshaded part becomes shaded, something is wrong with mesh’s lighting property?