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
let customValue;
          if (isString(value)) {
            customValue = stringToPDFString(value);
          } else if (isName(value) || isNum(value) || isBool(value)) {
            customValue = value;
          } else {
            info(`Unsupported value in document info for (custom) "${key}".`);
            continue;
          }
          if (!docInfo.Custom) {
            docInfo.Custom = Object.create(null);
          }
          docInfo.Custom[key] = customValue;
        }
      }
    }
    return shadow(this, "documentInfo", docInfo);
  }
  get fingerprints() {
    function validate(data) {
      return (
        typeof data === "string" &&
        data.length > 0 &&
        data !== EMPTY_FINGERPRINT
      );
    }
    function hexString(hash) {