Destructor not running when using AsyncActionCompletedHandler

Question

Consider the following code in C++/CX:

    std::shared_ptr<int> a(new int(9));
        
    int cnt = a.use_count(); // == 1

    {
        auto ppp = ref new AsyncActionCompletedHandler(
            [a](IAsyncAction^ asyncInfo)
            {        
            });

        cnt = a.use_count(); // == 2
    }    
    
    cnt = a.use_count(); // still == 2 !!!

Is this a bug ?

Note that it's C++/CX, no GC here, so 'ppp' is destroyed on scope exit, however, 'a's destructor not run...

Answer 1

Would someone from MS tell me whether it's a bug or not please and how to work around it...