Desert willage scene

I work on enviromental scene with some buldings and other assets.Mainly from great Quixel Megascans.Sometimes I modified materials or assets for my purposes.I used first time vertex paint materials on walls here.I like this feature.But I have problems,sometimes some white outlines are appearing,anybody knows please,how to repair it?I think,it is somehow related with ambient field distant oclussion with skylight-mode MOVABLE.I marked problem with red circles on some screenshots.Thank you very much for any advice.