Apple's 12mini stops in the APP and won't stop. What's going on here?

The above situation may be related to the "gaze perception" function of iPhone.

Users can view and manage the "gaze awareness function" in iPhone settings, accessibility, face ID and gaze.

By default, this feature is on. When this function is turned on, the iPhone will automatically detect whether the user is staring at the screen of the mobile phone, then dim the screen, and expand the notification or reduce the volume of the reminder after unlocking. In other words, if it is detected that you have been looking at the screen of the mobile phone, the iPhone will not automatically lock the screen; If you are looking at the screen of your mobile phone, there are calls, text messages and alarm clock reminders, and the volume of the reminders will be automatically lowered.