Expansion of macro 'ObservationTracked' produced an unexpected 'init' accessor

After updating Xcode to 15 beta 3, errors started appearing on the var properties of my @Observable models when building my project for Apple Vision Pro.

> Expansion of macro 'ObservationTracked' produced an unexpected 'init' accessor

There's also this error. I think it's related:

> External macro implementation type 'ObservationMacros.ObservableMacro' could not be found for macro 'Observable()'; the type must be public and provided by a macro target in a Swift package, or via '-plugin-path' or '-load-plugin-library'

Apparently, Xcode 15 beta 3 introduced a regression for this specific case. As mentioned in the release notes.

> - visionOS projects that use the @Observable property wrapper will fail to build in Xcode 15 beta 3. (111494849)
Workaround: Continue using Xcode 15 beta 2.

If you are making an app for Apple Vision Pro and are making use of the new Observation framework, you better stay away from the third beta and stick to Xcode 15 beta 2.

EDIT: It looks like beta 5 works now. Please make sure there's no space in the Xcode app name as @Jari mentioned.

Make sure you don't have spaces in the filename of the Xcode app. Renaming the app file from "Xcode-beta 2" to "Xcode-beta-2" fixed the missing macro issue for me.