I also don’t think it would get too lost either. Even when you watch the scene, I don’t think right away the audience think “Vader knows Luke is there” when he asks about the shuttle. It seems RIGHT at that moment the thinking was more like
"there is a shuttle that came from no where and wants to go to planet, that seems a bit odd."
A shuttle coming from somewhere is exactly what you would expect, when you need workforce and things for the construction.
Nothing odd about that.