Steps to Reproduce

You can check it by opening NewMap.umap in the attached project.

Even if it is "r.RayTracing.Reflections.Translucency 0", it will show up in the raytraced reflection.
If it is a single Material, there is no problem.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-126698 in the post.

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By Design
ComponentUE - Rendering - Lumen
Affects Versions4.27
CreatedSep 15, 2021
ResolvedSep 17, 2021
UpdatedSep 19, 2021