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`.
super(parameters, { isRenderable: true });
    const { filename, content } = this.data.file;
    this.filename = getFilenameFromUrl(filename);
    this.content = content;
    this.linkService.eventBus?.dispatch("fileattachmentannotation", {
      source: this,
      id: stringToPDFString(filename),
      filename,
      content,
    });
  }
  render() {
    this.container.className = "fileAttachmentAnnotation";
    const trigger = document.createElement("div");
    trigger.style.height = this.container.style.height;
    trigger.style.width = this.container.style.width;
    trigger.addEventListener("dblclick", this._download.bind(this));
    if (!this.data.hasPopup && (this.data.title || this.data.contents)) {
      this._createPopup(trigger, this.data);
    }
    this.container.appendChild(trigger);
    return this.container;
  }
  /**
   * Download the file attachment associated with this annotation.
   *
   * @private
   * @memberof FileAttachmentAnnotationElement
   */
  _download() {