I am trying to display a pdf file with the PDFKit and the NSViewRepresentable wrapper

The following code displays a grayed frame and not the contents of the selected pdf file

import SwiftUI
import AppKit
import PDFKit

struct ContentView: View {
  @State var pdfURL: URL? = nil
  
  var body: some View {
    VStack {
      Button {
        let panel = NSOpenPanel()
        panel.allowsMultipleSelection = false
        panel.canChooseDirectories = false
        if panel.runModal() == .OK {
          if let src = panel.url {
            pdfURL = src
          }
        }
      } label: {
        Text("Pick a PDF file")
      }
      PDFKitView(url: pdfURL)
        .scaledToFit()
    }
    .padding()
  }
}

#Preview {
    ContentView()
}

struct PDFKitView: NSViewRepresentable {
  let url: URL?
    
  func makeNSView(context: NSViewRepresentableContext<PDFKitView>) -> PDFView{
    let pdfView = PDFView()
    if let url = url {
      pdfView.document = PDFDocument(url: url)
    }
    return pdfView
  }
  
  func updateNSView(_ nsView: PDFView, context: NSViewRepresentableContext<PDFKitView>) {
  }
  
}

I cannot figure out what I am doing wrong.
Here is a screenshot after picking a pdf file

Screenshot