The required period of notice with respect to a discontinuation or reduction of compensation is not affected by--
(a) a review decision made by an insurer or by the Commission that affirms the original decision of the insurer with respect to the discontinuation or reduction, or
(b) the withdrawal of a request for internal review of the original decision with respect to the discontinuation or reduction, or
(c) the withdrawal of the referral to the Commission for determination of a dispute about a work capacity decision, or the discontinuance or dismissal of proceedings before the Commission in relation to the dispute.