Effective July 1, 1984, the board shall not subsequently issue any bonds therefor as provided by and authorized under Section 34-22.7; provided, however, that nothing contained herein shall effect the validity of any obligations of the board lawfully incurred, pursuant to authorization granted by that Section, and existing on or prior to July 1, 1984. All such obligations shall be discharged as provided pursuant to that authorization and the extension for collection of taxes of the board, pursuant to levies made in accordance with that authorization, shall in no way be impaired or restricted.
105 ILCS 5/34-22.9