Changing the value from 50 down to 10 will reduce the duplications but grow the dark/black areas.
I try to render nice glass and get these duplications of the internal reflections and refractions. There is no black object in the scene, the glass hovers in a white sphere or OctaneSky (same output). It is path tracing, the glass is real size.

I have never seen this kind of duplications on real glass. Photos of this glass as well don't show them up, neither the duplications nor the black areas.
Does anybody know this issue, and knows maybe a solution as well? I think I must be one click away from the right switch.
Btw., it is the same result exporting an orbx and rendering in standalone.
=> v2022.1.1