Cal. Prob. Code § 5012

A provision of this chapter concerning rights between a married person and the person’s spouse in community property is relevant only to controversies between the person and spouse and their successors and does not affect the obligation of a holder of community property under an instrument of a type described in Section 5000 to hold, receive, or transfer the property in compliance with a provision for a nonprobate transfer on death, or the protection provided the holder by Section 5003.