Hey Krimson,
I tried your suggestions, and have spent hours trying to figure out a solution to this but to no avail. I think the problem stems from emissive materials not having a feature to turn off their emitting light. Other users have suffered from the same problem it seems.
There are lots of examples in games where we want emissive but don’t need to light the environment with it, such as highlighting a collectable on the floor, so it’s sad not to see this feature yet.
The best I have got for now is this command:
r.Lumen.ScreenProbeGather.ScreenTraces 0
Because I keep the benefit of Lumen but turn off the issue. Although i can still see reflections in the distance.
If there’s a fix for this issue it would be amazing, but for now i will wait and hope 
Cheers!