Why cocos2d::RepeatForever in cocos2d::Spawn doesn't work?

Question

This code works:

cocos2d::MoveBy* action = myCreateAction();
cocos2d::Animate* animation = myCreateAnimation();
cocos2d::Spawn* moving = cocos2d::Spawn::createWithTwoActions(action, animation);
runAction(moving);

This code works too, but animation is longer than action, therefore action are discontinuous:

cocos2d::MoveBy* action = myCreateAction();
cocos2d::Animate* animation = myCreateAnimation();
cocos2d::Spawn* moving = cocos2d::Spawn::createWithTwoActions(action, animation);
runAction(cocos2d::RepeatForever::create(moving));

If I run this code:

cocos2d::RepeatForever* action = cocos2d::RepeatForever::create(myCreateAction());
cocos2d::RepeatForever* animation = cocos2d::RepeatForever::create(myCreateAnimation());
cocos2d::Spawn* moving = cocos2d::Spawn::createWithTwoActions(action, animation);
runAction(moving);

Nothing happens. Why?