std::cout isn't printing after using std::wcout

Question

After I'm using std::wcout, std::cout isn't printing

int main() {
  std::wcout << "Hello " << std::endl;
  std::cout << "World" << std::endl;
}

Output:

Hello

---

int main() {
  std::cout << "Hello " << std::endl;
  std::wcout << "World" << std::endl;
}

Output:

Hello
World