Spy doesn't forward hashcode/equals to actual object

public class MockitoTest {

    private static class ValueHolder {
        private final String value;

        public ValueHolder( String value ) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }

        @Override public boolean equals( Object o ) {
            if (this == o) return true;
            if (!(o instanceof ValueHolder)) return false;
            ValueHolder that = (ValueHolder) o;
            return getValue().equals( that.getValue() );
        }

        @Override
        public int hashCode() {
            return Objects.hash( getValue() );
        }
    }

    @Test
    public void test() {
        ValueHolder value = new ValueHolder( "test" );
        ValueHolder spy = Mockito.spy( value );
        assert value.equals( spy );
        assert spy.equals( value ); //fails
        assert value.hashCode() == spy.hashCode(); //fails
    }
}