In file https://github.com/mozilla/pdf.js/files/5249872/product1.pdf, the fifth text widget has a default appearance using font F1 and this one is neither in DR nor in AcroForm but in AP::N::Resources.
const type = this.data.combo ? "combobox" : "listbox";
    const value =
      this.data.fieldValue.length > 0 ? this.data.fieldValue[0] : null;
    return {
      id: this.data.id,
      value,
      defaultValue: this.data.defaultFieldValue,
      editable: !this.data.readOnly,
      name: this.data.fieldName,
      rect: this.data.rect,
      numItems: this.data.fieldValue.length,
      multipleSelection: this.data.multiSelect,
      hidden: this.data.hidden,
      actions: this.data.actions,
      type,
    };
  }
}
class TextAnnotation extends MarkupAnnotation {