It can be confirmed that it's not an issue with my app. Even in a newly created test project with only MKMapView added, the problem persists.
Cushiro
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The additional callbacks of hitTest within the same lifecycle have the same point and frequency.
public class TestView: MKMapView {
public override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
let view = super.hitTest(point, with: event)
// repeated callbacks
return view
}
}