First, the "problem" is NOT a problem.
And, it has been there since GSX was released, but it doesn't have many chances to show itself, because it has no operator livery and, in order to have a chance to be selected, you must go to an airport were no real operator is assigned to and, even then, it will compete to be randomly chosen against the generic baggage truck.
So, it's just a rare object, likely to appear only in not-so-popular airports where we don't have any operator assigned to.