Mo. Rev. Stat. § 321.430: Prior obligations remain valid.

Any and all taxable tangible property located within any such district already organized on September 10, 1947, shall continue to be subject to the levy of taxes for general purposes and for the payment of any indebtedness previously created, all as provided herein. The repeal of any acts herein shall not be held to affect or invalidate any claims, demands, acts, debts, contracts, obligations or indebtedness of any district created under the provisions of any such act.