Why is this if with initializer not true?

int* get(){return nullptr;}

int main()
{
   if(auto p = get(); (*p) != 1231231233)
   {
        std::cout << "NO";   // not printed
   }
   else
   {
        std::cout << "we should be here" << std::endl;;   
   }
}

Why is here not NO printed, because according to the standard, the init-statement is not checked to true and the access to *p should be UB and we should result in true ?. I am puzzled: LIVE