Mo. Rev. Stat. § 137.722

Notwithstanding the provisions of section 137.721, or any other provision of law in conflict with the provisions of this section, in all counties which become counties of the second class after September 28, 1987, one percent of all ad valorem property taxes allocable to each taxing authority within the county and the county shall continue to be deducted from the collections of taxes each year and shall be deposited into the assessment fund of county as required by section 137.750 as if the county had retained its classification as a county of the third class.