Any contested case docketed for hearing before a board or commission abolished by this act shall continue to be under the jurisdiction of such board or commission until the case reaches final disposition at a hearing, with any ruling or adjudication of the board or commission binding. The rules of procedure and review for such boards or commissions in effect on the date of filing of the pending action shall remain in effect until the final disposition of the pending action, other provisions of this chapter notwithstanding. Where a contested case pending before a board or commission abolished by this act is continued under the jurisdiction of such board or commission as provided in this section and where that board or commission is abolished as provided by this act, that board or commission notwithstanding such provision abolishing it shall nevertheless continue in existence for the sole purpose of conducting and bringing to final disposition all such cases. Where any member of that board or commission has assumed another office after the abolition of that board or commission, he shall be considered an ex officio member of his former board or commission for the purposes of this paragraph. Any member of a board or commission abolished who continues to serve in the manner and for the purposes provided by this paragraph is entitled to receive only that mileage, per diem, and subsistence paid to members of state boards, commissions, and committees.