Rule 1023 There is no privilege under this article in a proceeding under Chapter 6 (commencing with Section 1367) of Title 10 of Part 2 of the Penal Code initia…

When a defendant in a criminal case asks the court to look into whether they are mentally sane, the normal rules about keeping mental health information private do not apply.

This means that if you are the one who brought up the question of your own sanity, a doctor or mental health professional can share what they know about your mental state in that hearing. You gave up that privacy protection by making the request yourself.