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
handler,
    task,
    normalizeWhitespace,
    includeMarkedContent,
    sink,
    combineTextItems,
  }) {
    const contentStreamPromise = this.getContentStream();
    const resourcesPromise = this.loadResources([
      "ExtGState",
      "Font",
      "Properties",
      "XObject",
    ]);
    const dataPromises = Promise.all([contentStreamPromise, resourcesPromise]);
    return dataPromises.then(([contentStream]) => {
      const partialEvaluator = new PartialEvaluator({
        xref: this.xref,
        handler,
        pageIndex: this.pageIndex,
        idFactory: this._localIdFactory,
        fontCache: this.fontCache,
        builtInCMapCache: this.builtInCMapCache,
        standardFontDataCache: this.standardFontDataCache,