411. A person who ceased to be a member of the Government and Public Employees Retirement Plan before 1 January 1997 while the person was holding a non-unionizable employment or who ceased to be a member of that plan between 31 December 1996 and 1 January 2001 while he or she was governed by the special provisions enacted under Title IV.0.1 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10), to whom a benefit is payable under that Act, shall continue to be governed by that Act as it read at the time the person ceased to be a member of that plan. However, any benefit established under that Title IV.0.1 and payable to the person after 1 January 2001, except the benefit relating to a pension credit or a paid-up annuity certificate, shall be payable under the Pension Plan of Management Personnel and the person shall become a pensioner under that plan. The first paragraph also applies to any benefit payable under the Government and Public Employees Retirement Plan before 1 January 2001 to the spouse or successors of the person referred to in that paragraph.