If the plaintiff in execution, for a valuable consideration, releases property which is subject to execution, the release shall be a satisfaction of the execution to the extent of the value of the property so released insofar as purchasers and creditors are concerned. However, nothing in this Code section shall apply to any such release made by the transferee of any execution issued for taxes due the state or any county or municipality therein or of any execution issued by any municipality on account of assessments made against real estate for street or other improvements. In all such cases the execution shall be discharged or satisfied only to the extent of the amount of taxes or other assessments owing by the parcel released.