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
});
      return partialEvaluator
        .getOperatorList({
          stream: contentStream,
          task,
          resources: this.resources,
          operatorList: opList,
        })
        .then(function () {
          return opList;
        });
    });
    
    
    return Promise.all([pageListPromise, this._parsedAnnotations]).then(
      function ([pageOpList, annotations]) {
        if (annotations.length === 0) {
          pageOpList.flush(true);
          return { length: pageOpList.totalLength };
        }
        
        
        const opListPromises = [];
        for (const annotation of annotations) {
          if (
            (intent === "display" &&
              annotation.mustBeViewed(annotationStorage)) ||
            (intent === "print" && annotation.mustBePrinted(annotationStorage))
          ) {
            opListPromises.push(