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 value = getInheritableProperty({
      dict: this.pageDict,
      key,
      getArray,
      stopWhenFound: false,
    });
    if (!Array.isArray(value)) {
      return value;
    }
    if (value.length === 1 || !isDict(value[0])) {
      return value[0];
    }
    return Dict.merge({ xref: this.xref, dictArray: value });
  }
  get content() {
    return this.pageDict.getArray("Contents");
  }
  get resources() {
    
    
    
    return shadow(
      this,
      "resources",
      this._getInheritableProperty("Resources") || Dict.empty
    );
  }
  _getBoundingBox(name) {