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 (this.data.checkBox) {
      return this._saveCheckbox(evaluator, task, annotationStorage);
    }
    if (this.data.radioButton) {
      return this._saveRadioButton(evaluator, task, annotationStorage);
    }
    
    return null;
  }
  async _saveCheckbox(evaluator, task, annotationStorage) {