In the case of a CSEC plan that is in funding restoration status for a plan year, no amendment to such plan may take effect during such plan year if such amendment has the effect of increasing liabilities of the plan by means of increases in benefits, establishment of new benefits, changing the rate of benefit accrual, or changing the rate at which benefits become nonforfeitable. This paragraph shall not apply to any plan amendment that is required to comply with any applicable law. This paragraph shall cease to apply with respect to any plan year, effective as of the first day of the plan year (or if later, the effective date of the amendment) upon payment by the plan sponsor of a contribution to the plan (in addition to any contribution required under this section without regard to this paragraph) in an amount equal to the increase in the funding liability of the plan attributable to the plan amendment.