Why my delegate = nil?

Hi!

I have protocol AllNotebookDelegate:

protocol AllNotebookDelegate: class {
    func passData(text: String,nameOfNotebook: String)
}

And also I have class AllNotebookCollectionVC with collectionView(didSelectRowAt:) method:

class AllNotebookCollectionViewController: UICollectionViewController {
    //MARK: - Variables
    var notebookItems: [NotebookItem] = []
    weak var delegate: AllNotebookDelegate?
    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let selectedItem = notebookItems[indexPath.item]
        delegate?.passData(text: selectedItem.text, nameOfNotebook: selectedItem.titleOfNotebook)
        
        // Present EditorVC
        let editorVC = storyboard!.instantiateViewController(withIdentifier: "editorVC")
        let navigationController = UINavigationController(rootViewController: editorVC)
        present(navigationController, animated: true, completion: nil)
    }
}

This is editorVC:

class EditorViewController: UIViewController {

    //MARK: - Variables & Outlets

    @IBOutlet weak var textView: UITextView!

    //MARK: - Private methods
    override func viewDidLoad() {
        super.viewDidLoad()
        let allNotebookVC = storyboard?.instantiateViewController(withIdentifier: "allNotebookVC") as! AllNotebookCollectionViewController
        textView.text = ""
        allNotebookVC.delegate = self
}

extension EditorViewController: AllNotebookDelegate {
    func passData(text: String, nameOfNotebook: String) {
        titleOfNavigationBar = nameOfNotebook
        textView.text = nameOfNotebook
    }

When I add a breakpoint at collectionView(cellForRowAt:) in AllNotebookVC debugger show me this:

So, why delegate = nil?