This is a mistake that has apparently just been discovered this month, so answers are thin.

Here is the only decent one I could find:

“What appears to have happened here,” u/itsjustmonty_ reports, “is that the camera traveled slightly too far and somehow no one noticed while cropping the footage.” They include a string of uncompressed shots from the Blu-ray and a wild behind-the-scenes clip that shows a crew member off in the distance while filming the shot roughly 10 seconds in. In other posts, they reiterate that this was not their original discovery and they are simply reposting on Reddit to shed light on something that bubbled up from other corners of Star Wars fandom.

Regarding the real-life identity of Anakin’s overlooker, an early suggestion was that it could be Nash Edgerton, Ewan McGregor’s stunt double.

Link.