I mean, why would you possibly have a hub connected to the switch if it wasn't connected to the laptop? Surely, nobody would ever disconnect their laptop and leave all of the other devices connected waiting and ready for the laptop to be reconnected at a later time. That's such an edge case that it could never have been thought of as a normal thing to test against. Only weirdos take their laptops away from a desk environment. What are they gonna do, use it on their laps?