1. On sw-CD locale:
    Month abbreviated and stand-alone abbreviated fallback incorrect. For example, the input data is: testMonth = "1";
test MonthDay stand-alone Abbreviated Format. There is no stand-alone abbreviated type in sw_CD.xml file, so should fallback to sw.xml as CLDR defined and get the result 'Jan', but actually Java return 'mkw' which is abbreviated type in sw_CD.xml file.
Use below code to get java's output.
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String tag = "sw-CD";
Locale target = Locale.forLanguageTag(tag);
MonthDay date = MonthDay.of(Integer.parseInt("1"), Integer.parseInt("5"));
String mPattern="LLL";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(mPattern, target);
formatter = formatter.withLocale(target);
String actualResult = date.format(formatter);
System.out.println(actualResult);
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This issue also happens on stand-alone wide type of sw_CD locale and below behaviors.
2. on es_US locale:
dayPeriod value with abbreviated type fallback incorrect. For example: the input data is: testYear = "1996";testMonth = "2";testDay = "8";testHour = "11";testMinute = "45";testSecond = "8";
Test LocalDateTime with Short format. There is no abbreviated dayPeriod type in es_US.xml file, so should fallback to es_419.xml as CLDR defined and get the result 'a.m.', but actually Java return 'AM' which is wide type in es_US.xml file.