shadow probelm at the edges of the roof and walls

Good day dear community,

I have a problem, which is probably just a small thing.

I use the Unity version 2021.2.17f1 with HDRP.
on the picture you can see what I mean.

The following is: the light shines through the walls and through the roof, but only at the corners.
how can i solve it?

I also have this effect when I build a large room from cubes.

View attachment 1039067