Any amendment, modification, or revocation of any section of this part or of any order, regulation, ruling, instruction, or license issued by or under the direction of the Secretary of the Treasury pursuant to section 3(a) or 5(b) of the Trading With the Enemy Act, as amended, or pursuant to Proclamation 3447, shall not unless otherwise specifically provided be deemed to affect any act done or omitted to be done, or any suit or proceeding had or commenced in any civil or criminal case, prior to such amendment, modification, or revocation, and all penalties, forfeitures, and liabilities under any such section, order, regulation, ruling, instruction or license shall continue and may be enforced as if such amendment, modification, or revocation had not been made.