My son has an iPhone 11 running iOS 17.5.1. When he gets a missed call notification that appears on the lock screen, tapping on the notification calls the number back, even if there's no phone number visible in the notification.

He taps on the notification to read it, he's prompted to unlock his phone and when he does, the phone has already called the number back. I've looked through all of the settings and do not see anything that would relate to this.

Can somebody please help with this strangeness?