UIScrollViewDelegate unresponsive on Mac Catalyst

As a official documentation all delegate methods of UIScrollViewDelegate are usable and supported with Mac Catalyst. I've done this sample UIViewController:

Code Block import UIKit
class sideMagnifier: UIViewController,UIScrollViewDelegate {
    var immagineDaMagnificare = UIImage()
    @IBOutlet weak var imgToMagnify: UIImageView!
    @IBOutlet weak var scrollToMagnify: UIScrollView!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.imgToMagnify.clipsToBounds = true
        self.scrollToMagnify.delegate = self
        imgToMagnify.image = immagineDaMagnificare
        self.scrollToMagnify.minimumZoomScale = 1.0
        self.scrollToMagnify.maximumZoomScale = 4.0
        let larghezzaContainer = UIScreen.main.bounds.width
        let altezzaContainer = UIScreen.main.bounds.height
        imgToMagnify.translatesAutoresizingMaskIntoConstraints = false
        imgToMagnify.widthAnchor.constraint(equalToConstant: larghezzaContainer).isActive = true
        imgToMagnify.heightAnchor.constraint(equalToConstant: altezzaContainer).isActive = true
    }
    func scrollViewDidZoom(_ scrollView: UIScrollView) {
        print("zoom")
    }
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        return self.imgToMagnify
    }
    @IBAction func dismissButtonTapped(_ sender: UIButton) {
        self.dismiss(animated: true)
    }
}

In iOS all works , pan and zoom even in simulator or real devices are working perfectly.
In MacCatalyst nothing works and events aren't firing. Seems that delegate is totally ignored, so, what is wrong here? Mine code, the documentation, whatever? Thanks