A logic issue was addressed with improved restrictions. This issue is fixed in iOS 14.0 and iPadOS 14.0, macOS Catalina 10.15.7, tvOS 14.0, watchOS 7.0. A malicious application may be able to access restricted files.
https://support.apple.com/HT211850
https://support.apple.com/HT211849
https://support.apple.com/HT211844
https://support.apple.com/HT211843
http://seclists.org/fulldisclosure/2020/Nov/22
http://seclists.org/fulldisclosure/2020/Nov/21