I was searching for this issue myself for a resolution, I’m not sure if you and I have the exact same problem, but I managed to resolve my problem by setting the Source Length and Source Radius back to 0, which fixed this strange issue where the light would be culled out or act strangely. They are 0 by default so unless you’ve adjusted these values, we may have a different issue. Of course, it’s been a long time since you posted this so I’m sure you may have solved it by now.