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 promise = this.pdfManager.ensureDoc("_parseHasJSActions");
    return shadow(this, "hasJSActions", promise);
  }
  /**
   * @private
   */
  async _parseHasJSActions() {
    const [catalogJsActions, fieldObjects] = await Promise.all([
      this.pdfManager.ensureCatalog("jsActions"),
      this.pdfManager.ensureDoc("fieldObjects"),
    ]);
    if (catalogJsActions) {
      return true;
    }
    if (fieldObjects) {
      return Object.values(fieldObjects).some(fieldObject =>
        fieldObject.some(object => object.actions !== null)
      );
    }
    return false;
  }
  get calculationOrderIds() {