CRUD Repository findById() different return value

In my SpringBoot applicatication I'm using CrudRepo. I have found a problem with return value: Required != Found

GitHub: https://github.com/einhar/WebTaskManager/tree/findById-problem

No matter about changing method return type from Task into Object -> IDE stopped show error, but then it could be problem due to validation of data type later on.

Do you know how to fix it? Any hint?

CrudRepo

public interface TaskRepository extends CrudRepository<Task, Integer> {}

Service

@Service
@Transactional
public class TaskService {

    @Autowired
    private final TaskRepository taskRepository;

    public TaskService(TaskRepository taskRepository) {
        this.taskRepository = taskRepository;
    }

    public List<Task> findAll() {
        List<Task> tasks = new ArrayList<>();
        for (Task task : taskRepository.findAll()) {
                tasks.add(task);
        }
        return tasks; // Work properly :)
    }
    /* ... */
    public Task findTask(Integer id) {
        return taskRepository.findById(id); // Find:Task | Required: java.util.Optional :(
    }
}