Slits shadow problems

Hello this is my firts post in the forum sorry if I am doing it incorretly

So, the problem is that I will like this render (a very early WIP) to have hard shadows. As you can see I have some stores in the window but they aren´t been showed in the shadows. I will like to know if blender have any problem (cycleX to be exact) rendering situacion similar to the double-slit experiment and if this is some quantic shit cycle do not manage well.

Thank you for taking your time to read this.

light setting

with volumen scattering

Make the light smaller and the shadow gets sharper.

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