Inconsistency between JapaneseEra start dates and java.util.JapaneseImperialDate

The JapaneseEra class defines the 4 pre-existing Eras with a defined start date.
These dates are used for *some* of the methods that map dates to eras JapaneseEra.from(localdate).
But other methods, JapaneseDate.ofYearDay(Era, yoe, dayOfYear) go directly to the java.util.JapaneseImprerialCalendar.
But the hard coded start dates do not match the start dates configured in lib/calendar.properties.

This occurs in JapaneseEra.MEIJI (Sept 8 vs Jan 1).