Custom image flies in MKAnnotationView, how to fix it?

Question

Swift

Hello!
placed on MKMapView MKAnnotation (preliminarily issued in the customAnnotation class for loading an array of data from a file). Next in func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? put a picture:

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard annotation is customAnnotation else { return nil }
        
        let identifier = "Annotation"
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
        
        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            annotationView!.canShowCallout = true
        } else {
            annotationView!.annotation = annotation
        }
        
        annotationView?.image = UIImage(named: "chicken")
        return annotationView
    }

Everything works well:


As soon as I exit the application (do not delete it from memory), and go back in, the cast image disappears:


in this case, the function func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? is not called (that is, the problem is not in it).

Console - IconRenderer: HorizontalStretchPadding (18.000000, 18.000000) is larger than the image size (34.000000, 54.000000). Image will now use the center column of pixels to stretch.
But I do not think that this is a problem, since then the picture would not have been displayed initially.

Please tell me how to fix. Thank you in advance!