ModelMapper with generic custom type

Question

I'm using Java library ModelMapper to map my local (JPA) model to a DTO version.

Model

@Entity
public class City {
    @Id @GeneratedValue
    private Long id;
    private String postalCode;
    private String name;

    // getter/setter/etc.
}

DTO

public class CityDto {
    private Long id;
    private String postalCode;
    private String name;

    // getter/setter/etc.
}

Wrapper

I'm going to pass lists of these classes with an additional int, for which I created a genericly typed wrapper class.

public class Wrapper<T> {
    private List<T> entities;
    private Integer count;

    //getter/setter/etc.
}

Question

Now, I want to convert a Wrapper<City> into a Wrapper<CityDto>. I thought that it's the same as converting a List<City> into List<CityDto> as explained in the answer to ModelMapper changes generic type on runtime - weird behavior.

@Test
public void test() {
    // prepare
    ModelMapper modelMapper = new ModelMapper();
    modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.LOOSE);
    Wrapper<City> wrapper = ...

    // act
    Type type = new TypeToken<Wrapper<CityDto>>() {}.getType();
    Wrapper<CityDto> cityDtos = modelMapper.map(wrapper, type);

    // check
    Assertions.assertTrue(cityDtos.getEntities().get(0) instanceof CityDto);
}

This test fails. I get the same exception as in the aforementioned question

java.lang.ClassCastException: com.my.model.City cannot be cast to com.my.dto.CityDto

The nested list has objects of the type City and not the expected CityDto. What am I doing wrong?

---

Remark

As a workaround I am doing something like this.

Wrapper<City> wrapper = ...
List<CityDto> cityDtos = modelMapper.map(wrapper.getEntities(), new TypeToken<List<CityDto>>() {}.getType());
Wrapper<CityDto> converted = new Wrapper<>(cityDtos, wrapper.getCount());

That works, but I'd like to know why my original idea is not working.