Attach (recommended) or Link to PDF file here:
[Scan-to-Mail-PDF1_(1).pdf](https://github.com/mozilla/pdf.js/files/6876708/Scan-to-Mail-PDF1_.1.pdf)

Configuration:
- Web browser and its version: Firefox Developer 91.0b7 (64-Bit)
- Operating system and its version: Windows 10 (21H1)
- PDF.js version: 2.10.339 (also tested with the online demo, Version 2.11.5)
- Is a browser extension:

Steps to reproduce the problem:
1. Open the attached pdf
2. Scroll to page 3

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/7944797/126957487-cc7a2d19-adfb-42e4-9809-74e1a7a85048.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/7944797/126957351-29aebb4d-eadd-4273-b69d-530b9060c12c.png)




return this._transport.getPageIndex(ref);
  }
  /**
   * @returns {Promise<Object<string, Array<any>>>} A promise that is resolved
   *   with a mapping from named destinations to references.
   *
   * This can be slow for large documents. Use `getDestination` instead.
   */
  getDestinations() {
    return this._transport.getDestinations();
  }
  /**
   * @param {string} id - The named destination to get.
   * @returns {Promise<Array<any> | null>} A promise that is resolved with all
   *   information of the given named destination, or `null` when the named
   *   destination is not present in the PDF file.
   */
  getDestination(id) {
    return this._transport.getDestination(id);
  }
  /**
   * @returns {Promise<Array<string> | null>} A promise that is resolved with
   *   an {Array} containing the page labels that correspond to the page
   *   indexes, or `null` when no page labels are present in the PDF file.
   */
  getPageLabels() {