(a) A citation or notice in a probate matter that is required to be served by posting and is issued in conformity with this title, and the service and return of service of the citation or notice, is valid if:
(1) a sheriff or constable posts a copy of the citation or notice at the location or locations prescribed by this title; and
(2) the posting occurs on a day preceding the return day of service specified in the citation or notice that provides sufficient time for the period the citation or notice must be posted to expire before the specified return day.
(b) The fact that a sheriff or constable, as applicable, makes the return of service on the citation or notice described by Subsection (a) and returns the citation or notice on which the return has been made to the court before the expiration of the period the citation or notice must be posted does not affect the validity of the citation or notice or the service or return of service. This subsection applies even if the sheriff or constable makes the return of service and returns the citation or notice on which the return is made to the court on the same day the citation or notice is issued.