With IR on, you may be getting some reflection off of that beam. There could be an issue with the camera or it may just be placement.
I think it's the placement :-\ . Swapped it out with a brand new camera and it was almost worse than before. Blocked some of the light from the below sconce and it almost all disappeared. I do somehow have a smudge on the inside of the glass, too. Not sure how that got there and if it's adding to the issue. Looks like I'll need to move it into the dark area above or block the light on that side of the fixture.