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 { catalog, linearization } = this;
    if (
      typeof PDFJSDev === "undefined" ||
      PDFJSDev.test("!PRODUCTION || TESTING")
    ) {
      assert(
        linearization && linearization.pageFirst === pageIndex,
        "_getLinearizationPage - invalid pageIndex argument."
      );
    }
    const ref = Ref.get(linearization.objectNumberFirst, 0);
    return this.xref
      .fetchAsync(ref)
      .then(obj => {
        
        if (
          isDict(obj, "Page") ||
          (isDict(obj) && !obj.has("Type") && obj.has("Contents"))
        ) {