Section 23. An appeal from a final or interlocutory order or decree in equity of a probate court made in the exercise of any jurisdiction in equity shall not suspend or stay proceedings under such order or decree pending the appeal. But the probate court or a justice of the supreme judicial court, in case of such appeal, may stay all proceedings under such order or decree and make necessary or proper orders to protect the rights of persons interested pending the appeal; and any such order of the probate court for a stay of proceedings or for protection of any such rights may be varied or discharged by a justice of the supreme judicial court upon motion, and shall not be otherwise subject to an appeal.