[MVT] vbox throws a CCE

[Remi Forax]

When i try to execute this code:

public final class Test {
  private final int value;

  public java.lang.String toString();
    Code:
       0: aload_0
       1: getfield      #11                 // Field value:I
       4: invokedynamic #23,  0             // InvokeDynamic #0:makeConcatWithConstants:(I)Ljava/lang/String;
       9: areturn

  public static void main(java.lang.String[]);
    Code:
       0: vdefault      #27                 // class ";QTest;"
       3: iconst_3
       4: vwithfield    #28                 // Field ";QTest;".value:I
       7: vstore        1
       9: getstatic     #34                 // Field java/lang/System.out:Ljava/io/PrintStream;
      12: vload         1
      14: vbox          #2                  // class Test
      17: invokevirtual #40                 // Method java/io/PrintStream.println:(Ljava/lang/Object;)V
      20: return
}

with this command line:
java -Xverify:none -XX:+EnableMVT Test

i get this exception:
Exception in thread "main" java.lang.ClassCastException: vbox not from value type
	at Test.main(Unknown Source)

This is not clear for me why ?

cheers,
Rémi