What’s wrong?
show-Develope-Path Tracing
Engine have problem with save reflections. It’s always start from zero in every frame. He dont use any reflection data from t-1 frame, its just stupid.
You need more ray bounces than one if you want to see reflection in the reflection :).
As Marcin already said, you need to set the “r.RayTracing.Reflections.MaxBounces” at least to 2 if you want to see “reflections in reflections”. Or you can set it in the PostProcessVolume.