If any existing contract or any provision of any existing contract between a mutual insurance company subject to section 3941.47 of the Revised Code and a hospital is determined unlawful as a consequence of the repeal of Chapter 1739. of the Revised Code, then only such provisions of the agreement that have thereby directly or indirectly become unlawful or provisions that flow therefrom are void, and the balance of such provisions remain in effect subject to section 3941.47 of the Revised Code.