CALayer as SCNMaterial content leaks...

LeakyCALayerViewController.swift

import Cocoa
import SceneKit

class ViewController: NSViewController {

    @IBOutlet weak var sceneView: SCNView!
    @IBOutlet weak var loadButton: NSButton!
    override func viewDidLoad() {
        super.viewDidLoad()
        loadButton.target = self
        loadButton.action = #selector(self.loadAction)

    }
    var cameraNode : SCNNode = {
        let camera = SCNCamera()
        camera.usesOrthographicProjection = true
        let node = SCNNode()
        node.camera = camera
        node.position.z = 50
        return node
    }()
    

    
    func loadAction(sender: NSButton) {
        let enable = sender.state == NSOnState
        if enable {
            let parentNode = SCNNode()
            
            let box = SCNBox(width: 50, height: 50, length: 50, chamferRadius: 1)
            box.firstMaterial?.diffuse.contents = NSColor.red
            let boxNode = SCNNode(geometry: box)
            parentNode.addChildNode(boxNode)
            
            
            
            let plane = SCNPlane(width: 300, height: 300)
            plane.firstMaterial?.diffuse.contents = TestLayer()
            let planeNode = SCNNode(geometry: plane)
            parentNode.addChildNode(planeNode)
            
            let newScene = SCNScene()
            newScene.rootNode.addChildNode(parentNode)
            newScene.rootNode.addChildNode(self.cameraNode)
            self.sceneView.scene = newScene
            self.sceneView.autoenablesDefaultLighting = true
            
        } else {
            self.sceneView.scene = nil
        }
        
    }


}


class TestLayer : CALayer {
   
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    override init() {
        super.init()
        self.frame = NSMakeRect(0, 0 , 300, 300)
        self.backgroundColor = NSColor.clear.cgColor
    }
    deinit {
        print("I'm deinited")
    }
}