添加＆＃34;名称＆＃34;（MKMapItem iOS10）标记在地图上消失

Question

此代码

        let latitude:CLLocationDegrees =  location.coordinate.latitude
        let longitude:CLLocationDegrees =  location.coordinate.longitude
        let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
        let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
        let mapItem = MKMapItem(placemark: placemark)
        mapItem.name = location.address
        mapItem.openInMaps(launchOptions: nil)

添加mapItem.name = location.address时在iOS10上

当地图已经有相同的标记时，标记将在地图上消失。 但这个问题在iOS9上没有显示。