[v3.0.3 smart_holder] Using smart_holder in virtual inheritance relationship error

[MannixYang]

The following code about virtual inheritance relationship , i use smart_holder instead of std::shared_ptr.

class Animal {
public:
  virtual std::shared_ptr<Animal> clone() const = 0;
  virtual ~Animal() = default;
};

class Cat : virtual public Animal {
public:
  virtual ~Cat() override = default;
};

class Tiger : virtual public Cat {
public:
  Tiger() = default;
  Tiger(const Tiger &) = default;
  ~Tiger() override = default;
  std::shared_ptr<Animal> clone() const override {
    return std::make_shared<Tiger>(*this);
  }
};

void bind_animals(pybind11::module_ &module) {

  pybind11::class_<Animal, pybind11::smart_holder>(module, "Animal");

  pybind11::class_<Cat, Animal, pybind11::smart_holder>(module, "Cat");

  pybind11::class_<Tiger, Cat, pybind11::smart_holder>(
      module, "Tiger", pybind11::multiple_inheritance())
      .def(pybind11::init<>())
      .def("clone", &Tiger::clone);
}

In python code:

tiger = Tiger()
tiger.clone()

An error occurred：

due to a fatal error condition:
  SIGSEGV - Segmentation violation signal

But it is ok to use std::shared_ptr as py::class_ holder. Are there problems with my usage of the smart_holder.
Can anyone help me with this? It's urgent. Thank you very much!