I’ve not been able to reproduce this on my end. I used your setup for your spot light and only used stationary ones in my scene since static lights would not affect the character player anyway.
Tim, I have found the culprit: A missing lightmass importance volume.
I found it out when I tried to make the repro level for you and I did not have the issue even when I copy pasted the entire room from the other level.
Thank you very much for looking into it, Epic’s support is the best out there!
Problem solved: adding a missing lightmass importance volume allows UE to calculates the volume lighting samples properly. I did not know that and I’m happy to see it is not an issue!