No shadows cast by `CSGBox3D`s despite Cast Shadows being On

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Godot Version

Version 4.3-4 on Garuda Linux with Radeon

Repro Project

Zipped 6KB

Question

So my CSGBox3Ds cast no shadows with factory-default out-of-box worldenv/sunlight/render-settings and their Cast Shadow set to On:

Screenshot_20240926_080903
Screenshot_20240926_0809031920×1200 127 KB

Right now I’m doing this course where the instructor has 4.1 on Windows and there the CSGBox3Ds are casting their shadow:

Screenshot_20240926_081237
Screenshot_20240926_0812371920×1200 130 KB

Might there be an obscure non-obvious setting in Project Settings I have messed up? Because under Rendering / Lights and Shadows every setting just has its default value.

Wondering if obscure 4.3-4 bug or gfx driver or HW bug… do your CSGBox3Ds cast shadows?