MapKit: rendering MKCircle with unwanted artifacts

Question

I use MKCircle to display the user's location in MKMapView. This is done with a few lines of code:

MKCircle creature:

self.mapCircle = MKCircle(center: pinLocation, radius: 50)
self.mapView.add(self.mapCircle!)

Rendering using MKMapViewDelegate:

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        guard let circle = overlay as? MKCircle else { return MKOverlayRenderer(overlay: overlay) }

        let renderer = MKCircleRenderer(circle: circle)

        renderer.strokeColor = .red
        renderer.lineWidth = 1

        return renderer
}

It behaves pretty well until I zoom out and go back. Then I get an artifact of a vertical line that appears in the same place all the time. It does not depend on the stroke width.

Does anyone know of any solution to avoid this artifact?