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Scene becomes unlit as I switch to light to static

Hi

(using UE5 5.0.0 Windows, default setting)

I have this simple scene: a floor with a cube on it lit by a static directional light:
Steps:

  • Open Unreal Editor 5 and create an empty archetechtural project without starter content
  • delete all objects except floor and postprocess volume
  • create a new directional light, rotate it downwards and create a cube
  • switch the directional light from stationary to static
  • build the scene

and as it finishes the whole scene turns black, as if there would be no light in it.
Why is that?

Here is a video if that:
Video-Youtube