StringBuffer append CharSequence is broken in Tiger-Beta2 build 49

Tried on Solaris-9 and WinXP Prof

How to reproduce, execute the test case mentioned below.

public class Test3 {
    
    public void assertion1() {
       StringBuffer sb = new StringBuffer();
       for (int i =0; i<127; i++) {
         char ch = (char)i;
         if( Character.isDefined(ch)) {
            sb .append(ch);
          } else {
             System.out.println("codepoint is not defined :"+ i);
          }
       }
       StringBuffer sb2 = new StringBuffer((CharSequence)sb);
       System.out.println("sb :"+sb.toString());
       System.out.println("sb2 :"+sb2.toString());
       if(sb.toString().equals(sb2.toString())) {
            System.out.println("They are same");
       } else {
            System.out.println("They are different");
       }
       System.out.println("sb length Initially :"+sb.length());
       sb.append((CharSequence)sb2, 4, 6);
       String str = sb2.toString() + sb2.toString().substring(4,10);
       if(sb.toString().equals(str)) {
          System.out.println("Test Pass");
       } else {
          System.out.println("Test Fail");
       }
       System.out.println("sb length :"+sb.length());
       System.out.println("str length :"+str.length());
       
    }
    
    public static void main(String args[]) {
        Test3 ref = new Test3();
        ref.assertion1();
    }

}