The Bridge Card in Michigan (food) lets the cardholder spend any and all accumulated benefits even after they return to work. Their situation may have improved to the extent that if they were to apply for new assistance, they would not be approved. However, any remaining benefits from their previously applied-for request for assistance can be used up over an indefinite period of time.
I'm not seeing the problem here. Taking away unused benefits when someone returns to work would create an incentive to either spend everything as soon as it comes in or to not bother looking for work, neither of which is desirable.