Question of using CCSequence

cocos2d-x C++
#1

Hello, I have a question of using CCSequence.
Please see code below.

void HelloWorld::menuCallback(CCObject* pSender)
{
    // "close" menu item clicked
    CCFiniteTimeAction *seq = CCSequence::actions(
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fa), NULL),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fc), NULL),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fb), NULL),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fc), NULL),
        NULL
        );
    this->runAction(seq);
}

void HelloWorld::fa(CCNode *node, void* data)
{
    CCLog("1");
}

void HelloWorld::fb(CCNode *node, void* data)
{
    CCLog("2");
}

void HelloWorld::fc(CCNode *node, void* data)
{
    CCLog("3");
}

I thought that would output :
1
3
2
3

but really output is:
1
3
3 <= ?
2
3

If I write like below, I get a correct output.

    CCFiniteTimeAction *seq = CCSequence::actions(
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fa), NULL),
        CCDelayTime::actionWithDuration(0),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fc), NULL),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fb), NULL),
        CCCallFuncND::actionWithTarget(this, callfuncND_selector(HelloWorld::fc), NULL),
        NULL
        );

Is it a bug?
I am using cocos2d-x 2.0.

#2

Yeap, i think it is a bug.
#1298 is created for it.

Thank you.