Issues with baking of Invisible Terrain

Hi guys! I have a problem

I notice that my rock wall assets have not the typical black shadow bakes, and sometimes I trying to check reasons. So I think this shadow is baked because I use invisible areas for my terrain;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==

I see that bug shadows dropped by terrain after making part of terrain mesh to visible;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==

So it’s very sad because invisible terrain have right collisions in default (it’s great), but invisible parts drop shadows in baking mode (and it’s not)

Maybe someone came across this and can help?