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)

marginV = this.margin.topInset + this.margin.bottomInset;
    }
    const width = Math.max(this[$extra].width + marginH, this.w || 0);
    const height = Math.max(this[$extra].height + marginV, this.h || 0);
    const bbox = [this.x, this.y, width, height];
    if (this.w === "") {
      style.width = measureToString(width);
    }
    if (this.h === "") {
      style.height = measureToString(height);
    }
    const html = {
      name: "div",
      attributes,
      children,
    };
    applyAssist(this, attributes);
    const result = HTMLResult.success(createWrapper(this, html), bbox);
    if (this.breakAfter.children.length >= 1) {
      const breakAfter = this.breakAfter.children[0];
      if (handleBreak(breakAfter)) {
        this[$extra].afterBreakAfter = result;
        return HTMLResult.breakNode(breakAfter);
      }
    }
    delete this[$extra];
    return result;
  }
}
class SubformSet extends XFAObject {