This published case here from 1/5 calls out counsel for failing to acknowledge precedent that was known but not disclosed (fn. 4):
We admonish counsel to candidly acknowledge such authority in the future. (See Eisenberg et al., Cal. Practice Guide: Civil Appeals and Writs (The Rutter Group 2020) ¶ 9:58 [“Your failure to confront unfavorable relevant holdings will be regarded as an attempt to deceive and mislead the court.”]; Rules Prof. Conduct, rule 3.3(a)(2) [“A lawyer shall not: [¶] . . . [¶] (2) fail to disclose to the tribunal legal authority in the controlling jurisdiction known to the lawyer to be directly adverse to the position of the client and not disclosed by opposing counsel,” fns. omitted].)