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.getOutline();
  }
  /**
   * @returns {Promise<OptionalContentConfig>} A promise that is resolved with
   *   an {@link OptionalContentConfig} that contains all the optional content
   *   groups (assuming that the document has any).
   */
  getOptionalContentConfig() {
    return this._transport.getOptionalContentConfig();
  }
  /**
   * @returns {Promise<Array<number> | null>} A promise that is resolved with
   *   an {Array} that contains the permission flags for the PDF document, or
   *   `null` when no permissions are present in the PDF file.
   */
  getPermissions() {
    return this._transport.getPermissions();
  }
  /**
   * @returns {Promise<{ info: Object, metadata: Metadata }>} A promise that is
   *   resolved with an {Object} that has `info` and `metadata` properties.
   *   `info` is an {Object} filled with anything available in the information
   *   dictionary and similarly `metadata` is a {Metadata} object with
   *   information from the metadata section of the PDF.
   */
  getMetadata() {