@Observable not working in Xcode playgrounds

Creating an Observable class in an Xcode playground seems to cause an error. This stops me from being able to run the playground.

As a demo, try creating a playground page and add:

import Foundation
import Observation // Doesn't seem to make a difference whether it's added or not.

@Observable public class NewViewModel: Observable {
    var value: Int = 1
    
    func increment() {
        value += 1
    }
}

Tapping the run button logs the following error (and then it builds successfully, buy fails silently):

error: Untitled Page.xcplaygroundpage:7:9: error: expansion of macro 'ObservationTracked()' did not produce a non-observing accessor
    var value: Int = 1
        ^

Putting the cursor on @Observable and then selecting Editor > Expand Macro shows that value has been annotated with @ObservationTracked and I if I re-run the playground I can even see the @ObservationTracked generated code.

Macros:

import Foundation
import Observation // Doesn't seem to make a difference whether it's added or not.

@Observable public class NewViewModel: Observable {
    @ObservationTracked

    // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:7:5-7:5

    var value: Int = 1
        {
            @storageRestrictions(initializes: _value)
            init(initialValue) {
            _value = initialValue
        }

        get {
            access(keyPath: \.value)
            return _value
        }

        set {
            withMutation(keyPath: \.value) {
                _value = newValue
            }
        }
    }

    // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:7:20-7:23
    
    func increment() {
        value += 1
    }
    @ObservationIgnored private let _$observationRegistrar = Observation.ObservationRegistrar()

    internal nonisolated func access<Member>(
        keyPath: KeyPath<NewViewModel, Member>
    ) {
      _$observationRegistrar.access(self, keyPath: keyPath)
    }

    internal nonisolated func withMutation<Member, MutationResult>(
      keyPath: KeyPath<NewViewModel, Member>,
      _ mutation: () throws -> MutationResult
    ) rethrows -> MutationResult {
      try _$observationRegistrar.withMutation(of: self, keyPath: keyPath, mutation)
    }

    @ObservationIgnored private var _value: Int = 1

    // original-source-range: /Users/gabriel.banfalvi/work/forums_observation/ObservationFramework.playground/Pages/Untitled Page.xcplaygroundpage:12:1-12:1
}

I can't seem to be able to expand the @ObservationIgnored macros, which may or may not be related to the issue. I can't expand them in a regular Xcode app, but it doesn't lead to any problems there.

Im running an iOS playground. I get this in Xcodes 15 beta 6 and 5. I get a different error in earlier versions.