Word file used: 
[Formular_T.docx](https://github.com/mozilla/pdf.js/files/6907859/Formular_T.docx)

PDFs generated:
PDF 1: [Formular_T_default.pdf](https://github.com/mozilla/pdf.js/files/6907771/Formular_T_default.pdf)
PDF 2: [Formular_T_changed.pdf](https://github.com/mozilla/pdf.js/files/6907772/Formular_T_changed.pdf)

- PDF.js version: v2.9.359

Steps to reproduce the problem:
1. Create Word Document with Checkbox and check it.
2. Convert Word document to PDF using **Aspose.pdf** (for .net)

3. Extra: Change value of second Checkbox  in PDF 1 and save the file (PDF 2). The new File will show both Checkboxes checked in other browser, but only the newly checked one in PDF.js

Expected:
Checkbox is checked (pdf viewer from adobe/Chrome Version 92.0.4515.107 64-bit)
![image](https://user-images.githubusercontent.com/76941221/127659557-42be1cca-3c90-49b8-b224-70ee85aa1b30.png)

Result:
Checkbox is not checked (Mozilla Firefox/PDF.js)
![image](https://user-images.githubusercontent.com/76941221/127660064-e3cdc3f9-6887-4ae7-af27-d46cded69029.png)



this.data.lineCoordinates[3] + borderAdjust,
      ];
      if (!Util.intersect(this.rectangle, bbox)) {
        this.rectangle = bbox;
      }
      this._setDefaultAppearance({
        xref: parameters.xref,
        extra: `${borderWidth} w`,
        strokeColor,
        fillColor,
        strokeAlpha,
        fillAlpha,
        pointsCallback: (buffer, points) => {
          buffer.push(
            `${lineCoordinates[0]} ${lineCoordinates[1]} m`,
            `${lineCoordinates[2]} ${lineCoordinates[3]} l`,
            "S"
          );
          return [
            points[0].x - borderWidth,
            points[1].x + borderWidth,
            points[3].y - borderWidth,
            points[1].y + borderWidth,
          ];
        },
      });
    }
  }
}
class SquareAnnotation extends MarkupAnnotation {