On recount, ballots may be challenged for incompleteness, ambiguity, or other defects, in accordance with the following procedure:
(a) The person challenging the ballot shall state the reason for the challenge.
(b) The official counting the ballot shall count it as the official believes proper and then set it aside with a notation as to how it was counted.
(c) The elections official or appointee pursuant to Section 15625 shall, before the recount is completed, determine whether the challenge is to be allowed. The decision of the elections official is final.