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._htmlForXfa;
  }
  /**
   * NOTE: This is (mostly) intended to support printing of XFA forms.
   *
   * @type {Object | null} An object representing a HTML tree structure
   *   to render the XFA, or `null` when no XFA form exists.
   */
  get allXfaHtml() {
    return this._transport._htmlForXfa;
  }
  /**
   * @param {number} pageNumber - The page number to get. The first page is 1.
   * @returns {Promise<PDFPageProxy>} A promise that is resolved with
   *   a {@link PDFPageProxy} object.
   */
  getPage(pageNumber) {
    return this._transport.getPage(pageNumber);
  }
  /**
   * @param {RefProxy} ref - The page reference.
   * @returns {Promise<number>} A promise that is resolved with the page index,
   *   starting from zero, that is associated with the reference.
   */
  getPageIndex(ref) {