RealityKit how you can assist submit course of with customized digital camera

I’ve this following minimal reproducible code:

import UIKit
import RealityKit

class ViewController: UIViewController {

  override func viewDidLoad() {
    tremendous.viewDidLoad()
    
    let arView = ARView(body: self.view.body)
    view.addSubview(arView)
    let anchor = AnchorEntity()
    arView.scene.addAnchor(anchor)
    
    let field = ModelEntity(mesh: .generateBox(measurement: 0.5), supplies: [SimpleMaterial(color: .red, isMetallic: false)])
    field.place = [0, 0, -1]
    anchor.addChild(field)
    
    // A customized digital camera
    let digital camera = PerspectiveCamera()
    anchor.addChild(digital camera)
    
    // submit course of
    arView.renderCallbacks.postProcess = { _ in
      print("submit course of")
    }
  }
}

It crashes with this (see pic):

Thread 1: EXC_BREAKPOINT (code=1, subcode=0x1e86b40b4)

It says it stops at a breakpoint, however I didn’t have any breakpoint setup.

If I take away the submit course of, it really works. If I take away the customized digital camera entity, it additionally works. Nevertheless, in my use case, I’ve to make use of each (primarily as a result of i would like to alter data like fov, and there isn’t any such API to alter the default digital camera)