In my case, the issue occurred after installing an app with the same bundle identifier that was installed through TestFlight. I removed the TestFlight version of the app, ran this command, and the extension appeared again: /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

@DTS Engineer Yes, I can replicate it on macOS 15.5 Beta 1 (24F5042g) as well.: FWIW, the macOS of my initial comment was Sequoia 15.4 (24E248).