I don’t know if this bug has ever been reported but there is a graphics bug in Halo CE Anniversary.
It’s manifested with a small lighting effect in the lower right corner of the screen. Like there’s a flashlight coming out of the corner.
I’ve tested it. It’s not the Xbox. It’s, not either my TV or monitor. And it’s not the MCC, because the classic graphics don’t have the same issue.
Hope this helps 