(2) When any person who has taken a promotional examination, and who has been appointed to a position in a higher classification or grade on probation, fails to qualify for the position in the higher classification or grade within the probationary period, the person shall not lose seniority in the lower classification or grade from which such promotion was made but shall return to employment and be reinstated in the position held by the person in such lower classification or grade. [Amended by 1965 c.186 §1]