Blender 3D problems with soft shadows. How to decide?

Question

Blender

Blender 3D problems with soft shadows
For several days now I can't figure out what the problem might be... I need soft shadows for the scene, without a nickname, but they work very strangely. From any light source, soft shadows are crushed, which is why there is a shadow with a cobweb effect. I am attaching a photo. I already added samples for rendering, increased the quality of shadows to the maximum and vice versa... The problem remained relevant. Please help, maybe someone knows the solution.