Minn. Stat. § 382.15

The rights and liabilities of the parties to the original bond of any such officer, existing or incurred at or prior to the time of the approval and filing of such new bond, shall not be in any wise affected or impaired by the giving of such new bond; but such original bond and the sureties thereon shall not be liable for the acts of such officer done or performed after the new bond is approved, recorded, and filed as required by law.