California Code, Probate Code - PROB § 10591

(a) The failure of the personal representative to comply with subdivision (a) of Section 10580 and with Sections 10581, 10585, 10586, and 10589, and the taking of the action by the personal representative without such compliance, does not affect the validity of the action so taken or the title to any property conveyed or transferred to bona fide purchasers or the rights of third persons who, dealing in good faith with the personal representative, changed their position in reliance upon the action, conveyance, or transfer without actual notice of the failure of the personal representative to comply with those provisions.

(b) No person dealing with the personal representative has any duty to inquire or investigate whether or not the personal representative has complied with the provisions listed in subdivision (a).