BuddhistCalendar:set(year) can not set year before 543 correctly

when set year below 543, the output from get is different from what is set.

compile and run the attached code:
import java.util.*;
import java.text.*;

public class SetTest{
   public static void main(String[] args){
      Calendar budcal = Calendar.getInstance(new Locale("th", "TH"));
      
      budcal.set(Calendar.YEAR, 200);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(Calendar.YEAR, 543);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(Calendar.YEAR, 544);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(Calendar.YEAR, 2000);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
     
      budcal.set(300, Calendar.APRIL, 10);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(543, Calendar.APRIL, 10);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(544, Calendar.APRIL, 10);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
      budcal.set(3001, Calendar.APRIL, 10);
      System.out.println("Year:"+budcal.get(Calendar.YEAR));
   }
}
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the output is:
Year:887(expecting 200)
Year:544(expecting 543)
Year:544(expecting 544)
Year:2000
Year:787(expecting 200)
Year:544(expecting 543)
Year:544(expecting 544)
Year:3001