Mesh3d ignores lighting with orthographic projection

It seems like lighting of Mesh3d is ignored when orhogonal projection is used, example image:

With exactly the same plot, but with perspective projection, lighting is fine:

I just wonder if this is a known issue, or is it a bug somewhere?

I tried to play around with camera locations and lighting parameters (diffuse, ambient, etc.).

Only ambient lighting has effect when orthographic projection is enabled (as you can see in the picture above the whole mesh only has a single flat color) - maybe shader issue?

The version of plotly.py that I am using is 5.6.0.

まず、plotly.py 5.6.0 で正投影と透視投影を使用した Mesh3d の例を再現し、次にレンダリングの動作を比較して、疑わしい shader path を調査します。正投影で diffuse などの非環境光が mesh に影響し、透視投影のレンダリングにリグレッションが発生しなければ完了です。