Attach (recommended) or Link to PDF file here:
https://www.co.lucas.oh.us/DocumentCenter/View/44843/WIBApplicationForm

Configuration:
- Web browser and its version: Firefox Nightly 91.0a1 (2021-06-25) (64-bit)
- Operating system and its version: Windows 10.0.19043.1052
- PDF.js version: N/A

Steps to reproduce the problem:
1. enableXFA in Firefox Nightly
2. Open form

What is the expected behavior? (add screenshot)
Text renders (pg 2)
![image](https://user-images.githubusercontent.com/7104454/123516584-d39b9b80-d66a-11eb-956f-980c084b14af.png)

What went wrong? (add screenshot)
Text is missing 
![image](https://user-images.githubusercontent.com/7104454/123516599-e615d500-d66a-11eb-89ef-c49818e9b579.png)



constructor(attributes) {
    super(attributes, "b");
  }
  [$pushGlyphs](measure) {
    measure.pushFont({ weight: "bold" });
    super[$pushGlyphs](measure);
    measure.popFont();
  }
}
class Body extends XhtmlObject {
  constructor(attributes) {
    super(attributes, "body");
  }
  [$toHTML](availableSpace) {
    const res = super[$toHTML](availableSpace);
    const { html } = res;
    if (!html) {
      return HTMLResult.EMPTY;
    }
    html.name = "div";
    html.attributes.class = ["xfaRich"];
    return res;
  }
}
class Br extends XhtmlObject {