Black Shadow spots going under Medium quality Global Illumination

My teammate have same issue on GTX 1650 (UE 5.5 only), I have RTX 3070 and no issues in 5.4, 5.5.
Same clean (just cloned from GIT) projects. Drivers are newest. Materials are custom, but they are simple (no HLSL code used).
Render: ShadowMaps, Lumen (GI + Reflections), disabled Nanites, also no HW RayTracing.