UE 4.23 No raytraced reflection in glass

This is mindhunting me for a while…
In 4.22 I had raytraced reflections in glass. But in 4.23 preview7 I can not get any reflections on translucent surfaces. Only on opaque materials.
In other words… the same file with reflections in 4.22 does not show the reflections in 4.23…
Everything is set to raytracing like in 4.22.
Any ideas?

cmd>>r.RayTracing.Translucency 1

但是4.23rtx透明材质,只要玻璃后背面物体离玻璃比较, 就会出现裁切问题,不知道什么问题。