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.

Beginne damit, das Mesh3d-Beispiel mit orthografischer und perspektivischer Projektion in plotly.py 5.6.0 zu reproduzieren, vergleiche anschließend das Rendering-Verhalten und untersuche den vermuteten Shader-Pfad. Die Arbeit ist abgeschlossen, wenn diffuse und andere nicht-ambientale Beleuchtung das Mesh bei orthografischer Projektion beeinflussen, ohne das perspektivische Rendering zu beeinträchtigen.