Unless otherwise specifically provided, any amendment, modification, or revocation of any provision in or appendix to this part or chapter or of any order, regulation, ruling, or instruction issued by or under the direction of the Director of the Office of Foreign Assets Control does not affect any act done or omitted, or any civil or criminal suit or proceeding commenced or pending prior to such amendment, modification, or revocation. All penalties, forfeitures, and liabilities under any such order, regulation, ruling, or instruction continue and may be enforced as if such amendment, modification, or revocation had not been made.