@estudiobarrera Thank you for the link and for the solution.
But on other hand this is really bad workaround if there are already 3d modeled apartments/interiors with applied lightmaps. Meaning everything that we made before is not usable for chamfering since time = money and I really dont think that redoing everything just to chamfer concave/convex corners is a solution to the problem for arch-viz commercial production.
Why no one is using the adjusted values of VisibilityTangentOffsetSampleRadiusScale and VisibilityNormalOffsetSampleRadiusScale as suggested? The adjusted values from @ are working really well, I think (I havent the time to look more deeply around). So I am just really confused on why the chamfer workaround is better than just adjusting the variables?