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 annots = this._getInheritableProperty("Annots");
    return shadow(this, "annotations", Array.isArray(annots) ? annots : []);
  }
  get _parsedAnnotations() {
    const parsedAnnotations = this.pdfManager
      .ensure(this, "annotations")
      .then(() => {
        const annotationPromises = [];
        for (const annotationRef of this.annotations) {
          annotationPromises.push(
            AnnotationFactory.create(
              this.xref,
              annotationRef,
              this.pdfManager,
              this._localIdFactory,
               false
            ).catch(function (reason) {
              warn(`_parsedAnnotations: "${reason}".`);
              return null;
            })
          );
        }
        return Promise.all(annotationPromises).then(function (annotations) {
          return annotations.filter(annotation => !!annotation);
        });
      });
    return shadow(this, "_parsedAnnotations", parsedAnnotations);
  }
  get jsActions() {