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I wouldn't depend on undocumented behavior that probably is a coincidence like that. If you really don't want to do that, just do not register the extension, why should you if the user should not configure it. Otherwise the user could also still configure it by type without the notifications. And if you really want it registered, just don't do it on plugin application, but for example when your own helper is called. Usually if someone wants such notification, I recommend to just have one method in the extension that configures another object with the real properties and where you can do the notification at the end.