https://www.cnet.com/news/my-iphone-changed-my-password-and-locked-me-out-what-gives/

In the back of my head I heard the droning voice of an

            Apple
     IT rep at the Genius Bar from one of my possible futures saying "Did you try turning it off and on again?" In my haste to see if the bug would magically correct itself, I held down the power button. 

> But then I remembered something crucial: iPhones require your password after a restart. So now I couldn't unlock my phone using the fingerprint scanner. I needed a 6-digit passcode I didn't have. Yeah, it was a dumb move.