The problem isn’t that it’s a plot hole (I agree that it’s not), it’s that it’s an unexplained coincidence. Explanations help coincidences feel less coincidental and smooth out the immersion-breaking feeling they cause. Good explanations will completely eliminate coincidence completely (for instance, it’s not a coincidence that Luke met Obi Wan or that Obi Wan had Anakin’s lightsaber, since Obi Wan was Anakin’s former friend and mentor and was watching over Anakin’s son). Even weak explanations are better than nothing.

Without that minimal effort on the writer’s part, the human mind is immediately alerted to the fact that this is just actors reading from a script and that the writer couldn’t think of a more organic way to move the plot in the direction he wanted.