@isolated(any) isolation property is nil for non global actor isolation

[channing]

actor Shop {
    init() {
        Task {
            await onSelfActor()
        }
    }
    func onSelfActor() async {
        print(#isolation) // print Shop
        Task {
            let actor = #isolation
            print(actor) // print nil
        }
    }
}

Similar case.