Why does the key press cause UIGestureRecognizer to ended in Mac Catalyst

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture))
        
        pan.delegate = self
        
        view.addGestureRecognizer(pan)
    }
}

extension ViewController: UIGestureRecognizerDelegate {
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        
        return true
    }
}

extension ViewController {
    
    @objc func handlePanGesture(_ sender: UIPanGestureRecognizer) {
        
        switch sender.state {
        case .possible: print("possible")
        case .began: print("began")
        case .changed: print("changed")
        case .ended: print("ended")
        case .cancelled: print("cancelled")
        case .failed: print("failed")
        @unknown default: break
        }
        print("alternate:", sender.modifierFlags.contains(.alternate))
        print("command:", sender.modifierFlags.contains(.command))
        print("control:", sender.modifierFlags.contains(.control))
        print("shift:", sender.modifierFlags.contains(.shift))
    }
    
}