A Lock Screen issue was addressed with improved state management. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.0.1 and iPadOS 15.0.1. A user may be able to view restricted content from the Lock Screen.
https://support.apple.com/kb/HT213183
https://support.apple.com/en-us/HT212868