What causes the leak sanitizer to behave differently for T* and T*& in my struct implementation?

Question

why -fsanitize=address,leak behaves differently for T* and T*&?

I created a struct for pointer_ownership

template<class T>
struct pointer_ownership
{
    T* ptr;
    bool is_owner;
    pointer_ownership(T*& t_ptr, bool t_is_owner)
        : ptr(t_ptr), is_owner(t_is_owner)
    {
    }
};

And a main function

int main()
{
   auto *a = new int(32);
   pointer_ownership po(a, true);
   return 0;
}

When I build the code using below command and run it no leak sanitizer error is generated.

g++ -fsanitize=address,leak main.cpp  && ./a.out

But if I change T* to T*& in pointer_ownership struct then leak sanitizer error is generated.

Why leak sanitizer isn't showing error in case of T*?