visionOS and SwiftData: 'member' macro cannot be attached to property

1. Create a new Multiplatform App project
2. Select SwiftData as a storage option
3. In the main Target add Apple Vision as a Supported Destination target
4. Select "Apple Vision Pro" as a run destination
5. Build and run (start the active scheme)

Expect: Successful build

Actual: Build error:

/var/folders/25/7fgb4nf92lx09_gptkqy42f80000gn/T/swift-generated-sources/@__swiftmacro_6Sherpa4Item5ModelfMm_.swift:2:13 'member' macro cannot be attached to property

The code (with the macro expanded) looks like this:

@Model
final class Item {
    var timestamp: Date
    
    init(timestamp: Date) {
        self.timestamp = timestamp
    }
@Transient
private var _$backingData: any SwiftData.BackingData<Item> = SwiftData.DefaultBackingData(for: Item.self) // 'member' macro cannot be attached to property

public var backingData: any SwiftData.BackingData<Item> {
    get {
        _$backingData
    }
    set {
        _$backingData = newValue
    }
}

static func schemaMetadata() -> [(String, AnyKeyPath, Any?, Any?)] {
  return [
    ("timestamp", \Item.timestamp, nil, nil)
  ]
}

init(backingData: any SwiftData.BackingData<Item>) {
  self.backingData = backingData
}

@Transient
private let _$observationRegistrar = Observation.ObservationRegistrar() // 'member' macro cannot be attached to property
}