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 style = Object.create(null);
  if (!styleStr) {
    return style;
  }
  for (const [key, value] of styleStr.split(";").map(s => s.split(":", 2))) {
    const mapping = StyleMapping.get(key);
    if (mapping === "") {
      continue;
    }
    let newValue = value;
    if (mapping) {
      if (typeof mapping === "string") {
        newValue = mapping;
      } else {
        newValue = mapping(value, fontFinder);
      }
    }
    if (key.endsWith("scale")) {
      if (style.transform) {
        style.transform = `${style[key]} ${newValue}`;
      } else {
        style.transform = newValue;
      }
    } else {
      style[key.replaceAll(/-([a-zA-Z])/g, (_, x) => x.toUpperCase())] =
        newValue;
    }
  }