How have appellate courts treated the issue of ineffective assistance of counsel?

The appellate record before us does not expressly reveal why trial counsel failed to present exculpatory evidence relating to the charge of failing to appear on December 5, 2016. We thus turn to the evidence provided with the habeas corpus petition. (People v. Mendoza Tello, supra, 15 Cal.4th at pp. 266-267 [ineffective assistance of counsel claim is more appropriately decided in habeas corpus proceeding when appellate record sheds no light on the challenged act or omission].)