Attach (recommended) or Link to PDF file here:
[FormDB2_fr.pdf](https://github.com/mozilla/pdf.js/files/7352426/FormDB2_fr.pdf)

Configuration:
- Web browser and its version: Firefox nightly
- Operating system and its version: linux debian

Steps to reproduce the problem:
1. Open the pdf
2. The image on the top of each pages is missing 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/137465500-e8788893-f33d-4532-871d-43b464fa85f4.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/137465363-f2b35fe4-6776-45e9-b9e4-ccef6d9ad670.png)

const assist = obj.assist;
  if (assist) {
    const assistTitle = assist[$toHTML]();
    if (assistTitle) {
      attributes.title = assistTitle;
    }
    const role = assist.role;
    const match = role.match(HEADING_PATTERN);
    if (match) {
      const ariaRole = "heading";
      const ariaLevel = match[1];
      attributes.role = ariaRole;
      attributes["aria-level"] = ariaLevel;
    }
  }
  
  
  if (obj.layout === "table") {