Arrow key causes delta jump in spritekit.

Hello,

I have a problem where my macOS (Sequoia) Spritekit game spikes delta during the first press of an arrow key. I've test this with a small program, code below:

//
//  GameScene.swift


import SpriteKit
import GameplayKit

class GameScene: SKScene {
    var lastTime: TimeInterval = 0
    
    override func keyDown(with event: NSEvent) {
            print("---------------> delta keyDown: \(event.characters!) keyCode: \(event.keyCode)")
    }
    
    override func update(_ currentTime: TimeInterval) {
        // Called before each frame is rendered
        print("update begins")

        let dt: CGFloat
        if lastTime > 0 {
            dt = (CGFloat(currentTime - lastTime))
        } else {
            dt = 1.0 / 60.0
        }
        if dt > (1/30) {
            print("************************************ delta spike ", dt)
        }
        lastTime = currentTime
        print("dt: ", dt)
        print("update ends")

    }
}

Example output:

update begins
************************************ delta spike  0.03381687504588626
dt:  0.03381687504588626
update ends
update begins
dt:  0.016670208307914436
update ends

As you can see, when I press left arrow key in this case I get a big delta spike. There's no spike with further presses of the arrow key.

Other keys, such as the common W A S D controls for games, do not cause this delta spike.