The range of Japanese era is not correct when parsing from string

System.out.println(
  DateTimeFormatter.ofPattern("u-M-d").format(
    DateTimeFormatter.ofPattern("Gy年M月d日")
      .withChronology(JapaneseChronology.INSTANCE)
      .parse("平成31年5月1日")));

System.out.println(
  new SimpleDateFormat("Y-M-d", Locale.US).format(
    new SimpleDateFormat("Gy年M月d日", new Locale("ja","JP","JP"))
      .parse("平成31年5月1日")))

Expected Result:
  java.time.format.DateTimeParseException
  java.text.ParseException

Actual Result:
  2019-5-1
  2019-5-1