A proposal made by the governor or board under this chapter expires if the other entity does not adopt an order ratifying or changing the proposal before the 31st day after the date the proposal is published in the Texas Register. A contingent order adopted by the governor or board under this chapter expires if the other entity does not approve the order before the 31st day after the date the proposal on which the order is based is published in the Texas Register. A proposal or contingent order of either entity also expires if a regular or special session of the legislature begins before, respectively, the other entity has ratified the proposal or has approved the contingent order.