Unexpected rendering with SceneKit and CIFilter - swift

Question

Here is a simple SceneKit project with two boxes. I’ve added a CIBloom filter to one of them. When I rotate the scene, the ”glow” effect is rendered behind the other box?
I saw someone else had this issue and solved it by setting writesToDepthBuffer to false but in my case it’s important to keep all 3D data (I want to rotate around the scene).
I’ve provided a couple of images and the code.
I would really appreciate any help!
Here is the code I used:
import UIKit
import QuartzCore
import SceneKit
class GameViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// create a new scene
let scene = SCNScene()
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
let box = SCNNode(geometry: SCNBox(width: 8.0, height: 8.0, length: 2.0, chamferRadius: 0.0))
box.geometry?.firstMaterial?.diffuse.contents = UIColor.green
box.position.z = -4
scene.rootNode.addChildNode(box)
let box2 = SCNNode(geometry: SCNBox(width: 1.0, height: 1.0, length: 1.0, chamferRadius: 0.0))
box2.geometry?.firstMaterial?.diffuse.contents = UIColor.red
scene.rootNode.addChildNode(box2)
let bloomFilter = CIFilter(name:"CIBloom")!
bloomFilter.setValue(10.0, forKey: "inputIntensity")
bloomFilter.setValue(100.0, forKey: "inputRadius")
box2.filters = [bloomFilter]
// retrieve the SCNView
let scnView = self.view as! SCNView
// set the scene to the view
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
scnView.autoenablesDefaultLighting = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = UIColor.black
}
override var prefersStatusBarHidden: Bool {
return true
}
override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
if UIDevice.current.userInterfaceIdiom == .phone {
return .allButUpsideDown
} else {
return .all
}
}
}