Upon termination of a contract between a fire protection district and a separate fire department entity or upon dissolution of the fire department entity, if the fire department entity has assumed control of assets that were paid for by the fire protection district and if the contract does not provide for the transfer of assets, those assets shall revert back to the fire protection district for use in providing fire protection services. Nothing in this Section impairs any existing contract or prevents a fire department or fire protection district from making other provisions for the distribution of assets in the terms of a future contract.