Why Glass in Raytracing not pass Sunlight?

Hi
i asked about glass material
why till now lumen with ray tracing not support pass sunlight through glass material support ray tracing
to fix it i do shadow cast off or make cast raytracing inside Master material off

but when i use any other software support full raytracing is pass lighting from sun and sky very well with very good quality and fast …

please can anyone tell me why unreal not support this feature ???

thanks