Glas on revit imported windows lets no sun into the room

Hello,
the basic Glassmaterial on revit imported windows lets no sun into the room.
When i import only the windowframes and the glass seperatly and set the glass asset to “cast no shadows” the the sun is going thru.
Is this normal or am i doing something wrong.
i am using ue 5.02

In Case someone has the same problem. I solved it by unchecking “castraytraceshadows” in the Material. Simple solution