Any agreement or other instrument in connection with an agreement between a board of trustees and a board in effect on July 1, 2015, relating to the division of taxes under section 357H.9, the dissolution date of a rural improvement zone, or the criteria used for determining the need for improvements in the rural improvement zone that is inconsistent with this chapter shall be null and void. However, nothing in this chapter shall be construed to prohibit the board of trustees and the board from entering into an agreement on or after July 1, 2015, relating to the division of taxes under section 357H.9, the dissolution date of the rural improvement zone, or the criteria used for determining the need for improvements in the rural improvement zone, so long as such agreement does not violate the provisions of this chapter.