Type cast failures in C++: pointers vs references

#include <iostream>
#include <memory>
#include <typeinfo>
#include <vector>

namespace {
  using std::bad_cast;
  using std::cout;
  using std::make_unique;
  using std::unique_ptr;
  using std::vector;

  struct B { virtual void method() const = 0; virtual ~B() = default; };
  struct D1 : public B { void method() const override { cout << "D1\n"; } };
  struct D2 : public B { void method() const override { cout << "D2\n"; } };
}

int main() {
  const vector<unique_ptr<B>> objects{[] {
    vector<unique_ptr<B>> objects;
    objects.reserve(2);
    objects.push_back(make_unique<D2>());
    objects.push_back(make_unique<D1>());
    return objects;
  }()};
  for (const auto& object_ptr : objects) {
    if (const auto *const ptr{dynamic_cast<D1*>(object_ptr.get())}; ptr) {
      cout << "Successfully cast pointer to D1*; calling method(): ";
      ptr->method();
    } else {
      cout << "Failed to cast pointer to D1*; calling method(): ";
      object_ptr->method();
    }
    try {
      const auto &ref{dynamic_cast<D1&>(*object_ptr)};
      cout << "Successfully cast reference to D1&; calling method(): ";
      ref.method();
    } catch (const bad_cast&) {
      cout << "Failed to cast reference to D1&; calling method(): ";
      object_ptr->method();
    }
  }
}