Notwithstanding section
1053
(b)(1) of this title, for purposes of determining the employee’s accrued benefit under the plan, the plan may disregard service performed by the employee with respect to which he has received—
Paragraph (1) shall apply only if such distribution was made on termination of the employee’s participation in the plan. Paragraph (2) shall apply only if such distribution was made on termination of the employee’s participation in the plan or under such other circumstances as may be provided under regulations prescribed by the Secretary of the Treasury.