No such thing.

Maybe a rider gets caught off guard, startled, then visual fixation on hazard causes rider to steer TOWARD the hazard. Mountain bikers know this well - look where you WANT TO GO and not at the hazards you want to avoid or you will steer TOWARD them.

You can search online for a thousand years and you will find no science proving a large truck sucks IN air anywhere. It DISPLACES air OUTWARD as it passes because the air, and the box on the truck, can't occupy the same space at the same time just like a ship pushing though water. The water and air MUST go AWAY from the mass as it passes through the air/water. There is a miniscule drop in atmospheric pressure a few feet behind a large boxed truck but not enough to move more than a few dead leaves.

If semi truck vacuum existed, motorcycles would get sucked into it all day long. It does not exist.