Wis. Stat. § 857.19: When will proved after letters issued.

When after letters are issued to a personal representative by a court in the estate of a decedent, whether testate or intestate, a will of the decedent is proved and allowed by the court, the powers of the personal representative cease, and the court shall remove the personal representative. All acts of the personal representative before removal are as valid as if the will had not been allowed.