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 left = measureToString(this.x);
    const top = measureToString(this.y);
    const style = {
      left,
      top,
      width: measureToString(this.w),
      height: measureToString(this.h),
    };
    const classNames = ["xfaContentarea"];
    if (isPrintOnly(this)) {
      classNames.push("xfaPrintOnly");
    }
    return HTMLResult.success({
      name: "div",
      children: [],
      attributes: {
        style,
        class: classNames,
        id: this[$uid],
      },
    });
  }
}
class Corner extends XFAObject {