Man you're fast!
You can ignore the question about the prefab change, it was a misunderstanding on my end.
I was aware that the cage was changed a while back and it makes sense. I was referring to the lights inside the elevator shaft as it descends in "07-AI and Events.map". I noticed that the barrels there weren't casting shadows and when I checked the prefab it's "Cast Shadows" field was set to static. At first I assumed that had changed, not realizing that the light inside the prefab was still static+dynamic+buffered and it was a rendering issue.
Thanks again for dealing with it so quickly