Issues with hidden Mesh But keep the shadow and reflection

When hide the cube mesh ,there is some issues whit the reflection.but when i change the reflection method to raytracing in ppv,the reflections gose right.bug raytracing cost too much performance。

I tried different ways to hide mesh and keep shadow and reflection:
1,hidden actor in game ,and check the “hidden shadow”
2,set visible to false,and set “affect indirect lighting while hidden” to true
3,only owner see.

all have same issue.

here is the video.

This is due to screen tracing. You need to disable lumen reflection screen traces in order to achieve a different appearance in reflections.