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
const buf = [];
      for (let i = 0, ii = hash.length; i < ii; i++) {
        const hex = hash[i].toString(16);
        buf.push(hex.padStart(2, "0"));
      }
      return buf.join("");
    }
    const idArray = this.xref.trailer.get("ID");
    let hashOriginal, hashModified;
    if (Array.isArray(idArray) && validate(idArray[0])) {
      hashOriginal = stringToBytes(idArray[0]);
      if (idArray[1] !== idArray[0] && validate(idArray[1])) {
        hashModified = stringToBytes(idArray[1]);
      }
    } else {
      hashOriginal = calculateMD5(
        this.stream.getByteRange(0, FINGERPRINT_FIRST_BYTES),
        0,
        FINGERPRINT_FIRST_BYTES
      );
    }
    return shadow(this, "fingerprints", [
      hexString(hashOriginal),
      hashModified ? hexString(hashModified) : null,
    ]);
  }
  _getLinearizationPage(pageIndex) {