Alarm Stop and Snooze buttons missing

The first time my alarm goes off, the “Alarm” label, stop, and snooze buttons are missing. I only see a lock screen with the time. To turn the alarm off I need to snooze it with the side button, then unlock the phone and stop it in the notification tray. If I don’t dismiss the alarm, the buttons are back again when the snooze is finished.

The alarm is configured in the Apple Health sleep schedule, not the clock app. The problem is not solved by a reboot. iPhone 11, iOS 15.3.1. (Ignore the non-matching dates in the screen shots, I took them on different days)