Apple Corp. of the United States released the first beta version of iOS 13.3.1 and macOS Catalina 10.15.3 to developers today after the official iOS 13.3 update was released last week. The new Beta is also available for HomePod, iPad and Apple TV.
In iOS 13.3, a communication limitation function was added for screen usage time. IOS 13.3.1 system fixes system problems and improves system stability. However, if an unknown number is sent to the device, adding it to the address book can break the related restrictions, so Apple fixed this issue in iOS 13.3.1, making it impossible for anyone interested to use this screen time vulnerability.
first iOS 13.3.1, macOS 10.15.3 beta
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