Webb, also:- In the OG films, the actors used retroreflective rods. Not CGI post-effects, a lot of the time they had a physical thing in their hand... That can't be 'accidentally' in the wrong place.
"In the Season 3 finale of Stranger Things, you can pretty clearly tell that it's Mike's stunt double in one shot, and not Mike. Check out the dude's massively hairy legs."
Webb, also:- In the OG films, the actors used retroreflective rods. Not CGI post-effects, a lot of the time they had a physical thing in their hand... That can't be 'accidentally' in the wrong place.