Have you found a solution to this issue? None of my extensions from the App Store show up in System Preferences -> Extensions. This is so frustrating! Xcode's editor needs to be fixed once and for all and then they should leave it. I've written my own extensions just to have basic yank line, paste, restructure variable sections etc. only to have this break over and over.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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