Why does an inference error occur after type conversion?

Question

C++ / C#

Machinarium::DataStorages::SelfContainStorage::GetPathToRunningObject()

returns this type of path

const std::string s = Machinarium::DataStorages::SelfContainStorage::GetPathToRunningObject().string();

    std::cout << s.size() << ' ' << s.length() << std::endl;
    std::cout << s << std::endl;

    lua_pushlstring(L, s.c_str(), s.length() - 1);
    lua_setglobal(L, "ProgramRunningPath");

Conclusion.

$ 59 59
�|	��|	
                  ���m8}	ifm!��|	
                                          ���m�}	inlicen 
�|	��|	
                  ���m8}	ifm!��|	
                                          ���m�}	inlicen 
Running SelfRunningObjectStorageApi Payload.	Unix

instead of

/home/ubuntu/workspace/cpp.machinarium/bin/Release/licenses

What could be the problem, provided that the dimensions match?