No amendment made by any chapter of the Statutes of 1980, or any year thereafter, to Section 99 of the Revenue and Taxation Code shall be construed, except as expressly provided therein, to apply to a jurisdictional change initiated, pursuant to the applicable provisions of law governing those jurisdictional changes, prior to the effective date of the amendment. The provisions of Section 99 of the Revenue and Taxation Code in effect at the time the jurisdictional change is initiated shall govern the procedures for, and exchange of, property tax revenues between local agencies whose service area or service responsibility would be altered by that jurisdictional change, provided that there shall be no duty to impound any property tax revenues.