A reused cell shows someone else's image

Middle PRO

Task

In a list, fast scrolling makes cells flash the wrong images. The cell code:

final class PhotoCell: UITableViewCell {
    @IBOutlet private var photoView: UIImageView!

    func configure(with url: URL, loader: ImageLoader) {
        photoView.image = nil
        Task {
            let image = try? await loader.image(for: url)
            photoView.image = image
        }
    }
}

Why does it happen and how do you fix it?