Unique pointer - code example issue ?

[suhasghorp]

Working thru chapter 11 on Smart Pointers. I am not sure why I am getting a different num of instances than the book. I have removed the Catch2 test cases and put all code in main(). I do not get 2 instances at any point of time in the below code, contrary to what the books says. Thanks
C++20 with Visual Studio 2022

`struct DeadMenOfDunharrow {

DeadMenOfDunharrow(const char* m = "")
    : message{ m } {
    oaths_to_fulfill++;
}
~DeadMenOfDunharrow() {
    oaths_to_fulfill--;
}
const char* message;
static int oaths_to_fulfill;
};

int DeadMenOfDunharrow::oaths_to_fulfill{};

void print_number() {
    std::cout << "num of instances: " << DeadMenOfDunharrow::oaths_to_fulfill << std::endl;
}

int main()
{

auto aragorn = std::make_unique<DeadMenOfDunharrow>();
auto son_of_arathorn{ std::move(aragorn) };
print_number(); // prints 1 
son_of_arathorn = std::make_unique<DeadMenOfDunharrow>();
print_number(); // prints 1, book expects 2 here
son_of_arathorn = std::move(aragorn);
print_number(); // prints 0

}`