Nothing in this division shall operate to release any of the land excluded from the district from any obligation to pay, or any lien thereon of any valid outstanding bonds or other indebtedness of the district at the time of the filing of the petition for the exclusion of the land. The excluded land shall be subject to any lien, and answerable and chargeable for and with the payment and discharge of all outstanding obligations of the district at the time of the filing of the petition for the exclusion, as fully as though the petition for such exclusion were never filed and the order of exclusion never made.