A permanent employee in the classified service of any county having a population of 750,000 or more, who is elected to a county or state office shall be granted a leave of absence without pay from a position for the period of his or her entire service as an elected county or state officer and thereafter shall be entitled to return to the former position or to one with equivalent responsibility and pay in the classified service without loss of seniority or civil service status. At the discretion of the civil service commission, any elected state officer, while on leave of absence, may also be permitted to return to a former position or to one with equivalent responsibility and pay in the classified service for such periods of time as may be set by the commission. This section shall not apply to any department head in the classified service whenever the commission has established a list of department heads or employees of any county department under s. 46.215.