UINavigationBar button clipped

Question

I'm testing custom button for embedded navigation bar, but when passing to a second VC buttons (or when I go back from second to first) seem to have a sort of "clipping" on top and bottom side I cannot avoid. I have a button where I have a background image with a circle, and arrows as image.

I tested even a custom button, but something is not working

an image of my issue

in my first VC:

import UIKit


class ViewController: UIViewController {


    override func viewDidLoad() {
        super.viewDidLoad()

        //in SecondVC the image used as background seems a bit oval, or maybe "cutted" top and bottom sides
        addCustomUiButton()
        //this seems the best, but in SecondVC is cutted even more
        addBarButtonItem()

        //        multipleButtonOnTheSameSide()

        setImageForNavigation()
        customizeNavigationBar()
    }

    @IBAction func nextControllerButton(_ sender: Any) {
        performSegue(withIdentifier: "toNext", sender: nil)
    }

}


extension UIViewController {


    func addBarButtonItem() {
        let image = UIImage(named: "vectorSmartObject")?.withRenderingMode(.alwaysOriginal)
        let barButton = UIBarButtonItem(image: image, landscapeImagePhone: nil, style: .done, target: self, action: #selector(testAction))
        barButton.setBackgroundImage(UIImage(named: "backgroundGreenCyrcle"), for: .normal, barMetrics: .default)
        barButton.tintColor = .orange
        self.navigationItem.leftBarButtonItem = barButton

    }

    func addCustomUiButton()  {
        let myButton = CustomSimpleUiButton()

        self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: myButton)
        myButton.addTarget(self, action: #selector(testAction), for: .touchUpInside)
    }


    func multipleButtonOnTheSameSide() {

        let button1 = UIButton(type: .custom)
        button1.setImage(UIImage (named: "modifyIcon"), for: .normal)
        button1.setBackgroundImage(UIImage(named: "backgroundGreenCyrcle"), for: .normal)
        button1.frame = CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0)
        //        button1.backgroundColor = .systemPink
        button1.addTarget(self, action: #selector(testAction), for: .touchUpInside)
        let barButtonItem = UIBarButtonItem(customView: button1)

        let button2 = UIButton(type: .custom)
        button2.setImage(UIImage (named: "vectorSmartObject"), for: .normal)
        button2.setBackgroundImage(UIImage(named: "backgroundGreenCyrcle"), for: .normal)
        button2.frame = CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0)
        button2.backgroundColor = .systemPink
        button2.addTarget(self, action: #selector(testAction), for: .touchUpInside)
        let barButtonItem2 = UIBarButtonItem(customView: button2)

        self.navigationItem.leftBarButtonItems = [barButtonItem, barButtonItem2]

    }


    func customizeNavigationBar() {
        //        navigationController?.navigationBar.barTintColor = .clear//.purple
        //        navigationController?.navigationBar.tintColor = .clear//.white

        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.isTranslucent = true
        self.navigationController?.view.backgroundColor = UIColor.clear
    }


    func setImageForNavigation() {
        let logo = UIImage(named: "logo")
        let imageView = UIImageView(image:logo)
        self.navigationItem.titleView = imageView
    }

    @objc func testAction() {
        print("ok", Date())
    }


}

in my second VC

import UIKit

class SecondVC: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        setImageForNavigation()

        addBarButtonItem() //left, cutted a lot
        addCustomUiButton() //right, a bit cutted

//        multipleButtonOnTheSameSide() //a bit cutted
    }

    @IBAction func backButtonTapped(_ sender: Any) {
//        dismiss(animated: true, completion: nil)
        navigationController?.popViewController(animated: true)
    }


}

my custom button

class CustomSimpleUiButton: UIButton {


    override init(frame: CGRect) {
        super.init(frame: frame)

        setImage(UIImage (named: "modifyIcon"), for: .normal)
        setBackgroundImage(UIImage(named: "backgroundGreenCyrcle"), for: .normal)
        self.frame = CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0)

    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }


}