Screen Time is cited as being broken as of now and doesn't sync information between devices. Apple generally recommends a reboot as a possible fix for this issue.

Another broken essential feature of iOS beta 4 is the App Store - apps are quite likely to fail downloading the first time you try, but a subsequent retry should yield positive results. 

Apple also says that the cellular signal ...


원문출처 : https://www.phonearena.com/news/Apple-releases-iOS-12-developer-beta-4-and-it-introduces-lots-of-new...-bugs_id106757