why deinit of view controller is not calling using RXSwift?

I tried a few things but couldn't find a solution. I am navigating the controller in the onNext block but the deinit is not calling. I have also declared the self as weak in the rx closures.

Below is the complete class code. Please correct if I am doing anything wrong:

class LoginVC: UIViewController {

    //MARK:- Variables & Consts
    private let tag = "LoginVC"
    private let loginViewModel = LoginViewModel()
    private let disposeBag = DisposeBag()
    
    //MARK:- IBOutlets
    @IBOutlet weak var tfUsername: MFTextField!
    @IBOutlet weak var tfPassword: MFTextField!
    @IBOutlet weak var btnLogin: UIButton!
    
    //MARK:- View Controller Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupBindings()
    }
    
    ///deinit
    deinit {
        print(" deinit")
    }
    
    //MARK:- Custom Methods
    
    private func setupBindings() {
        loginViewModel
            .loginResponse
            .observeOn(MainScheduler.instance)
            .subscribe(onNext: { [weak self] loginResponse in
             let vc = UIStoryboard(name: Constants.MAIN, bundle: nil).instantiateViewController(withIdentifier: Constants.HOME_VC)
                self?.navigationController?.pushViewController(vc, animated: true)
            }, onError: { [weak self] error in
                self?.removeLoader()
            }, onCompleted: {  [weak self]  in
                self?.removeLoader()
            }, onDisposed: { [weak self] in
                print("\(self?.tag ?? "") onDisposed")
            })
        .disposed(by: disposeBag)
        
        btnLogin.rx.tap.bind{ [weak self] in
            self?.loginViewModel.login(username: self?.tfUsername.text ?? "", password: self?.tfPassword.text ?? "")
        }.disposed(by: disposeBag)
    }
}

Any help would be appreciated.