let currentUser = Parse.User.current
let userToUpdate = user.set(\.customKey, to: 5)
userToUpdate.save { result in
       print(Thread.isMainThread) 
       // This prints false even though save is called from main thread and default callback queue is set to main thread.
}

Task {
            do {
                let object = try await command(method: method,
                                               ignoringCustomObjectIdConfig: ignoringCustomObjectIdConfig,
                                               options: options,
                                               callbackQueue: callbackQueue)
                completion(.success(object)) // This is wrong. This line should be wrapped inside callbackQueue.async
            } catch {
                let defaultError = ParseError(code: .unknownError,
                                              message: error.localizedDescription)
                let parseError = error as? ParseError ?? defaultError
                callbackQueue.async {
                    completion(.failure(parseError))
                }
            }
        }