A member whose term expires and who is not reappointed may continue to serve as a temporary member of the Commission if a final report has not been made on an issue with respect to which he has participated in previous hearings, presentations, or investigations prior to the expiration of his term. Such continuing temporary membership shall be solely for the purpose of and limited to participation in the specific report. The beginning of the term of, and the rights, powers, and duties of the successor to the member whose term has expired shall not be affected by such continuing temporary membership.