Attach (recommended) or Link to PDF file here:
http://help.adobe.com/en_US/livecycle/11.0/SampleForms/941/Form.pdf

- Web browser and its version: Firefox 89.0.1
- Operating system and its version: Windows 10 10.0.19043.1052
- PDF.js version: commit bdfcdd6f8326f22c135edfa29a341ea4c558f3d1
- Is a browser extension: No

Steps to reproduce the problem:
1. Enable XFA support
2. Open form

What is the expected behavior? (add screenshot)
Page 3 (of 4) renders
![image](https://user-images.githubusercontent.com/7104454/122686842-622e9980-d1e1-11eb-92ab-86fe488560f2.png)

What went wrong? (add screenshot)
Only 3 pages total render in pdf.js
partialEvaluator
          .handleSetFont(
            resources,
            [Name.get(fontName), 1],
             null,
            operatorList,
            task,
            initialState,
             null,
             cssFontInfo
          )
          .catch(function (reason) {
            warn(`loadXfaFonts: "${reason}".`);
            return null;
          })
      );
    }
    await Promise.all(promises);
    const missingFonts = this.xfaFactory.setFonts(pdfFonts);
    if (!missingFonts) {
      return;
    }
    options.ignoreErrors = true;
    promises.length = 0;
    pdfFonts.length = 0;
    for (const missing of missingFonts) {
      for (const fontInfo of [
        { name: "Regular", fontWeight: 400, italicAngle: 0 },
        { name: "Bold", fontWeight: 700, italicAngle: 0 },
        { name: "Italic", fontWeight: 400, italicAngle: 12 },