The solution to this problem is to increase the parameter “Volumetric Lightmap Maximum Brick Memory Mb”. Values, I think everyone will have their own, because I will not write on how much I raised.
The problem is partially solved. I would also like to know what memory is used (GPU, RAM, Disk space) and how much does it affect the optimization? Maybe there is some documentation on this parameter? I would like to roughly imagine what exactly I am increasing. Thank.