The test file at https://github.com/mozilla/pdf.js/blob/master/test/pdfs/annotation-choice-widget.pdf contains listboxes, which are not rendered correctly when printed right now. These kinds of fields are made by https://github.com/mozilla/pdf.js/blob/master/src/display/annotation_layer.js#L672-L678.

/cc @calixteman 
if (Array.isArray(formValue)) {
      return formValue
        .filter(item => typeof item === "string")
        .map(item => stringToPDFString(item));
    } else if (formValue instanceof Name) {
      return stringToPDFString(formValue.name);
    } else if (typeof formValue === "string") {
      return stringToPDFString(formValue);
    }
    return null;
  }
  /**
   * Check if a provided field flag is set.
   *
   * @public
   * @memberof WidgetAnnotation
   * @param {number} flag - Hexadecimal representation for an annotation
   *                        field characteristic
   * @returns {boolean}
   * @see {@link shared/util.js}
   */
  hasFieldFlag(flag) {