Boost MPI not freeing resources when listening on lists?

This is the next question to How do I free boost :: mpi :: request? ... I observe strange behavior when listening to lists rather than individual items. Is this my mistake or a mistake in promoting? I am using MSVC and MSMPI, Boost 1.62. I'm pretty sure it doesn't behave normally while waiting for the job to be canceled.

If you try version B with mpiexec -n 2, then you get a clean output - if you try version A it freezes indefinitely. Do you see all this? This is mistake?

#include "boost/mpi.hpp"
#include "mpi.h"
#include <list>
#include "boost/serialization/list.hpp"

int main()
{
    MPI_Init(NULL, NULL);
    MPI_Comm regional;
    MPI_Comm_dup(MPI_COMM_WORLD, &regional);
    boost::mpi::communicator comm = boost::mpi::communicator(regional, boost::mpi::comm_attach);
    if (comm.rank() == 1)
    {


        //VERSION A:
        std::list<int> q;
        boost::mpi::request z = comm.irecv<std::list<int>>(1, 0, q);
        z.cancel();
        z.wait();


        //VERSION B:
//      int q;
//      boost::mpi::request z = comm.irecv<int>(1, 0, q);
//      z.cancel();
//      z.wait();

    }
    MPI_Comm_disconnect(&regional);
    MPI_Finalize();
    return 0;
}