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)



const xfaFont = Object.create(null);
    for (const [key, value] of this.style
      .split(";")
      .map(s => s.split(":", 2))) {
      if (!key.startsWith("font-")) {
        continue;
      }
      if (key === "font-family") {
        xfaFont.typeface = value;
      } else if (key === "font-size") {
        xfaFont.size = getMeasurement(value);
      } else if (key === "font-weight") {
        xfaFont.weight = value;
      } else if (key === "font-style") {
        xfaFont.posture = value;
      }
    }
    measure.pushFont(xfaFont);
    if (this[$content]) {
      measure.addString(this[$content]);
    } else {
      for (const child of this[$getChildren]()) {
        if (child[$nodeName] === "#text") {
          measure.addString(child[$content]);
          continue;
        }
        child[$pushGlyphs](measure);
      }