if you really want to make it invisible for the raytraced reflections, then i might have a solution four you (found a neat trick here in the forum). Change the materials blend mode to “masked” then add a RaytracingQualitySwitch to the Opacity Mask input, and for the switch inputs use a constant or parameter with 1 for the normal input and a constant/parameter with zero to the raytraced input.
With parameters you can decide during play and test, which variant is best for you. With parameters set to 1 for the normal, it becomes visible for the camera, with 1 for raytrace input, it becomes visible for the reflection. Zero makes it invisible for the camera (normal) or the reflection (raytraced).
Looks like this:
