Why are shadows constantly showing/hiding when using Brush Geometry?

I am modeling house interiors with brush geometry, and the shadows are hiding before they stop showing in camera.

Anyone knows what is exactly happening?
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Well, I think it is (provisionally) solved!
I changed the shadow map method from Virtual Shadow Maps(which is currently on Beta) to Shadow Map.

Maybe is there a solution for the Virtual Shadow Map, but currently it works for me:

If anyone in the future finds a solution for the other shadow method, I’ll be glad to hear about it.

EDIT: Now I have to get rid of those light lines on the wall edges.

If interested, here is the docu page about Vitrual Shadow Maps:

And this is the Google image that made me click on the link:

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