In this case I'm not sure how the wheel itself could roll along as it is seen in the one video, when the gear strut was pushed up into the avionics bay.
I'd say either the axle broke on impact, releasing the wheel then or as it folded into the wheel well, the wheel would be the first part of the gear to contact the floor above (and the fastest) and would have come off then.
I'd say the smart money is on it becoming detached on impact as it is much more likely to have become trapped in the well once the nose was down.