(a) Petition and Contents. A petition for revocation of probate shall state the interest of the petitioner in the estate and the facts constituting the grounds on which revocation is demanded.
(b) Continued Administration. Pending the determination of any issue for revocation of probate, the personal representative
shall proceed with the administration of the estate as if no revocation proceeding had been commenced, except that no distribution may be made to beneficiaries in contravention of the rights of those who, but for the will, would be entitled to the property disposed of.