Gridmap rotation cause shading error on macOS

[bitinn]

Tested versions

• reproduced in v4.4.1.stable.official [49a5bc7]
• reproducible in any of the 3 rendering pipeline

System information

macOS 15.4, Mac Studio M2 Max

Issue description

I have a hard time understanding this, but the gridmap example from the official document are showing shading error on many of the tiles.

At first I thought it might be normal import issues, but the actual model doesn't suffer from this issue.

Additionally, we can replace the material with our own and verify the same issue persists.

So my guess is somehow MeshInstance3D are being drawn incorrectly.

Steps to reproduce

Download the gridmap example from the official document and open in Godot 4.4.1

Just by rotating tiles in Y axis, you can see obvious shading errors.

Minimal reproduction project (MRP)

gridmap example from the official document