Had something like this happen in a match a couple of years ago. I was working with two assistants I trust a great deal. We were playing on a Field Turf field with all kinds of lines for different sports. The soccer lines were the yellow lines. I whistle for a foul that was outside of the area, but had a 100% brain cramp and thought the 10 yard line for American football was the penalty area line (it wasn't - the penalty area line didn't start until the 8-yard line). I signal for a penalty, and my lead AR immediately puts his flag up. He knew exactly what happened, and he knew that I'd happily award a free kick once I knew I was wrong.
Me to AR - "The foul was outside of the area, correct?"
AR - "Yes"
Me - "Thank you. We'll restart with a direct free kick on my whistle." A quick mea culpa to the attacker's bench (they were on this end of the field), and they completely understood.
In my pregame, I tell my ARs that I want "first look" in the area. If I make the decision straight away, I'll live with it. However, on a situation like my play or the one you've mentioned, I want my ARs to do anything possible - including running on the field - to let me know I need to change the call. Yes, I'll have a bruised ego. But I'd rather have that than to make a clear error that would have been avoided by my ARs bailing me out.