No employee of the commission and no member appointed by the Governor shall, with respect to any proposed legislation concerning matters assigned to the commission for study pursuant to Section 8293, advocate the passage or defeat of the legislation by the Legislature or the approval or veto of the legislation by the Governor or appear before any committee of the Legislature as to such matters unless requested to do so by the committee or its chairperson. In no event shall an employee or member of the commission appointed by the Governor advocate the passage or defeat of any legislation or the approval or veto of any legislation by the Governor, in his or her official capacity as an employee or member.