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 linearization = null;
    try {
      linearization = Linearization.create(this.stream);
    } catch (err) {
      if (err instanceof MissingDataException) {
        throw err;
      }
      info(err);
    }
    return shadow(this, "linearization", linearization);
  }
  get startXRef() {
    const stream = this.stream;
    let startXRef = 0;
    if (this.linearization) {
      
      stream.reset();
      if (find(stream, ENDOBJ_SIGNATURE)) {
        startXRef = stream.pos + 6 - stream.start;
      }
    } else {
      
      const step = 1024;
      const startXRefLength = STARTXREF_SIGNATURE.length;
      let found = false,
        pos = stream.end;