Safari Web Extension won't show in Safari preferences pane

Hi,

I'm trying to develop a Safari Web Extension in my app. But the extension won't show in Safari preferences pane.

I've already tried moving the app the application folder, which didn't work out either.

Also tried with demo project - Sea Creator, which didn't work either.

Safari App Extension works fine. BTW.

Xcode: Version 12.2 (12B45b)
Safari: Version 14.0.1 (16610.2.11.51.8)
macOS: Version 11.0.1 (20B29)

Is this a known bug or am I doing something wrong or I have to enrol the Apple Developer Membership?

Thanks.
After installing and uninstalling Safari Preview, it works now.
Update: It only works on Technology Preview for me.
You don't need a developer certificate if you're just going to test and run on your machine, but you need to "Allow Unsigned Extensions" under the develop menu. I'm not entirely sure but I think the safari extension "wrapper", actual web extension files and the containing app still need to be ad-hoc signed in this case.
You also need to make sure you enable Allow Unsigned Extensions in the Develop menu when you are using local built extension apps.
Safari Web Extension won't show in Safari preferences pane
 
 
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