UICollectionView.CellRegistration from custom nib

I'm trying to migrate from old style cell registration collectionView?.register(UINib(nibName: "MyCustomViewCell", bundle: nil), forCellWithReuseIdentifier: MyCustomViewCell.reuseIdentifier) to new UICollectionView.CellRegistration.

Currently I always end up with an NSInternalConstistencyException: view reuse identifier in nib (MyCustomViewCell) does not match the identifier used to register the nib (9AA266FF-550D-4A6B-ACCD-4E90B25E6DDC).

This is how I do my new style cell registration:

let cellRegistration = UICollectionView.CellRegistration<MyCustomViewCell, MyItem>(cellNib: UINib(nibName: "MyCustomViewCell", bundle: nil)) { cell, indexPath, item in
            cell.configure(with: item)
        }

If I use a default cell to test the whole collectionView setup everything works as expected (I see my cells etc.):

        let cellRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, MyItem> { cell, indexPath, item in
           // Populate the cell with our item description.
            var contentConfiguration = cell.defaultContentConfiguration()
            contentConfiguration.text = item.title
        }

My custom cell has a reuseIdentifier both in the nib file as well as in the class definition eg.:

class MyCustomViewCell: UICollectionViewCell {
    static let reuseIdentifier = "MyCustomViewCell"

Any hints?