Attach (recommended) or Link to PDF file here: [form-cms1500.pdf](https://github.com/mozilla/pdf.js/files/5670936/form-cms1500.pdf) (Original opened in Acrobat and checked one radio-button)
Original Source: https://www.cigna.com/static/www-cigna-com/docs/health-care-providers/form-cms1500.pdf

Configuration:
- Web browser and its version: FF 83.0
- Operating system and its version: Win 10 Pro
- PDF.js version: 2.7.355

Steps to reproduce the problem:
1. Open the PDF here: https://mozilla.github.io/pdf.js/web/viewer.html
2. See that all radio-buttons are checked, which is wrong.

What is the expected behavior? (add screenshot)
![grafik](https://user-images.githubusercontent.com/12390057/101734698-f72d3900-3ac0-11eb-817e-94ce276797e8.png)

What went wrong? (add screenshot)
![grafik](https://user-images.githubusercontent.com/12390057/101734712-fc8a8380-3ac0-11eb-833d-412243a7950c.png)

This radio-button field can be found in object `45 0 obj`.
return this.container;
    }
    const popup = new PopupElement({
      container: this.container,
      trigger: Array.from(parentElements),
      color: this.data.color,
      title: this.data.title,
      modificationDate: this.data.modificationDate,
      contents: this.data.contents,
    });
    
    
    const page = this.page;
    const rect = Util.normalizeRect([
      this.data.parentRect[0],
      page.view[3] - this.data.parentRect[1] + page.view[1],
      this.data.parentRect[2],
      page.view[3] - this.data.parentRect[3] + page.view[1],
    ]);
    const popupLeft =
      rect[0] + this.data.parentRect[2] - this.data.parentRect[0];
    const popupTop = rect[1];
    this.container.style.transformOrigin = `${-popupLeft}px ${-popupTop}px`;
    this.container.style.left = `${popupLeft}px`;
    this.container.style.top = `${popupTop}px`;
    this.container.appendChild(popup.render());
    return this.container;
  }
}
class PopupElement {