Crash on iOS18 Beta5 when adding a SCNAnimation animationDidStop closure with Swift6 selected

I'm trying to update my projects to use Swift6, if I change the project settings to use Swift6 then my app crashes when I add a closure to the SCNAnimation animationDidStop property. The error is inside the SceneKit renderingQueue and indicates that the callback is being called on the wring queue.

Maybe I need to do something in the code to fix this but I can't seem to make it work, maybe a SceneKit bug?

If you create a new game template in Xcode using SceneKit and replace the contents of GameViewController.swift with the following you will see the app crash after it is launched.

import UIKit
import SceneKit

class GameViewController: UIViewController {

  let player: SCNAnimationPlayer = {
    let a = CABasicAnimation(keyPath: "opacity")
    return SCNAnimationPlayer(animation: SCNAnimation(caAnimation: a))
  }()

  override func viewDidLoad() {
    super.viewDidLoad()

    let scnView = self.view as! SCNView
    scnView.scene = SCNScene()

    // Change the project settings to use Swift6
    // Setting this closure will then cause a _dispatch_assert_queue_fail
    // EXC_BREAKPOINT error in the scenekit.renderingQueue.SCNView queue,
    // the only thing on the stack is:
    // "%sBlock was %sexpected to execute on queue [%s (%p)]"
    player.animation.animationDidStop = { (a: SCNAnimation, b: SCNAnimatable, c: Bool) in
      print("stopped")
    }
    scnView.scene?.rootNode.addAnimationPlayer(player, forKey: nil)
    player.play()
  }

}