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.messageHandler.sendWithPromise("GetStructTree", {
      pageIndex,
    });
  }
  getOutline() {
    return this.messageHandler.sendWithPromise("GetOutline", null);
  }
  getOptionalContentConfig() {
    return this.messageHandler
      .sendWithPromise("GetOptionalContentConfig", null)
      .then(results => {
        return new OptionalContentConfig(results);
      });
  }
  getPermissions() {
    return this.messageHandler.sendWithPromise("GetPermissions", null);
  }
  getMetadata() {
    return this.messageHandler
      .sendWithPromise("GetMetadata", null)
      .then(results => {
        return {
          info: results[0],
          metadata: results[1] ? new Metadata(results[1]) : null,
          contentDispositionFilename: this._fullReader?.filename ?? null,
          contentLength: this._fullReader?.contentLength ?? null,
        };
      });
  }
  getMarkInfo() {