Question The problem at the joints of the walls with baked light.

Hello, my map consists of parts of the walls, floor and ceiling tightly docked using ProGrids. I have the following artifacts on photo. I've tried GPU and CPU lightmappers, but it's the same there. Thanks in advance.

 

Here are the settings, I lowered them to make the generation go faster. However, at a higher resolution, the problem persists.

If the map is a single object, there is no such problem, but when I decided to assemble the map from pieces for optimization purposes, there was a problem with the joints.