UI elements became not visible in iOS 13

After updating my iPhone to iOS 13 one of my app is missing some UI elements

1. back bar button item in navigation controller which is declared in viewDidLoad like that:

navigationItem.leftBarButtonItem = UIBarButtonItem(title: NSLocalizedString("Cancel", comment: "Cancel"), style: .plain, target: self, action: #selector(handelCancel))

I can dismiss view controller by swiping down and still can press on the place where leftBarButtonItem should be to perform func handelCancel. So button is invisible but it is still there

2. I have clustered annotations on mapKitView which is declared in viewDidLoad like that:

mapKitView.register(ClusterView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)

and have custom class:

class ClusterView: MKMarkerAnnotationView {

    override var annotation: MKAnnotation? {
        willSet {
            markerTintColor = UIColor(r: 247, g: 154, b: 16)

            let button = UIButton(type: .detailDisclosure)
            isEnabled = true
            rightCalloutAccessoryView = button
        }
    }
}

It became impossible to see clustered annotations, but if I zoom in annotations are there.

On devices with iOS 12 everything works fine. What changes should I make to make these elements visible again?