Okay, so I realized problem happens when I enable translucency type Ray Tracing in post process volume. With raster translucency the material appears but it’s low quality of course…
I tried changing other post process settings (GI, Reflection method… In default Im using GI Lumen and Screenspace reflections), changing glass material settings, looking for some RT material options and no success. Support ray tracing on skeletal mesh details is ticked.
When I turn on raytracing reflections method in post process, the opaque materials on skeletal meshes works normally and do raytraced reflections. Problem is only with translucent ones. They just disappear.