electron.webContents.printToPDF not working with NextJS page

[Matse2005]

My current code is:

ipcMain.on('print', (event, url, id) => {
  console.log('Print to pdf started')
  console.log(id)
  var filepath = path.join(app.getPath('desktop'), 'factuur-' + id + '.pdf')

  var options = {
    // marginsType: 0,
    pageSize: 'A4' as 'A4',  // This needs to be one of the specific allowed string literals
    printBackground: true,
    printSelectionOnly: true,
    landscape: false
  }


  let win = new BrowserWindow({
    show: false,
    webPreferences: {
      nodeIntegration: true
    }
  });

  // console.log(url)
  if (url.startsWith('http'))
    win.loadURL(url);
  else if (isProd)
    win.loadURL('app://.' + url);
  else
    win.loadURL(`http://localhost:${process.argv[2]}` + url);

  win.webContents.on('did-finish-load', () => {
    win.webContents.printToPDF(options).then(data => {
      fs.writeFile(filepath, data, function (err) {
        if (err) {
          console.log(err);
        } else {
          console.log('PDF Generated Successfully');
        }
        console.log('Done')
      });
    }).catch(error => {
      console.log(error)
    });
  });
})

Now is win.webContents.printToPDF not working with a NextJS page, only with an external website even if that one is a NextJS based website. Am I doing something wrong or is this just a known or unknow issue. It currently retuns a blank page