According to Macrumors, Apple seems to have withdrawn the latest macOS Mojave security update (2020-005), which was released on September 24 with the macOS Catalina 10.15.7 update. Apple also removed Safari 14 for macOS Mojave.
According to user feedback, the Mojave security update and the Safari 14 update have brought users a lot of problems: users who updated to macOS Mojave encountered problems such as slow device startup time, Finder freezes, and Migration Assistant crashes.
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Those who have updated the Mojave security update or installed Safari 14 should get a software update soon to fix existing problems. Users can also choose to restore Time Machine backups, reinstall macOS Mojave, or Install macOS Catalina to solve related problems.