In my special case, I needed a reflective floor which just reflects my scene and not the environment, so I got a infinity black background.
In case someone else runs into this problem, here is my solution for this:
Logged
It's not the end of the world. But you can see it from here.
C4D R20 Studio on Win10, AMD 7950X, RTX4090
C4D R20 Studio on macOs 10.13.6 on iMac 27" i7 End 2015