The problem of lighting in caves

At some camera positions, additional light penetrates into the caves (probably light from the sky). There shouldn't be such a light in the cave. The additional light disappears on closer inspection.

The problem manifests itself both day and night (but much more clearly during the day, especially when the Sun is low).

 

Seed: -63451782484948844

Position: 208 58 -351

Video: https://drive.google.com/file/d/1My1udqX5NR72sZ2IlfXcCwVW0pyP0iFF/view?usp=sharing