Translucency model have no shadow in 4.26

There are no shadows in the scene, but there are shadows in the reflection with rtx.IN 4.25 The same setting and materials, the shadow appeared.So is this a bug in 4.26?

hey! please do not call bug everything you find, that is the quickest way to get ignored by developers, you have also duplicated your thread.

Now regarding your question, this is the answer I got from Juan Canada the lead ray tracing engineer from Epic Games from UDN:

As you can see shadows with translucent material are not a thing in raytracing. Maybe they will improve on UE5

Thank you for your reply.I would be very happy if it could change in 4.27.

By the way,how to access the UDN?