Other() not working properly for periodic mesh in MPI

I got a segmentation fault running the attached code.
https://ngsolve.org/media/kunena/attachments/758/mpi_periodic.py
https://ngsolve.org/media/kunena/attachments/758/mpi_periodic.py

with this output message:

Fatal error in PMPI_Waitall: See the MPI_ERROR field in MPI_Status for the error code

Attachment: mpi_periodic.py

Thank you for the example, I will look into that too.

I have put in a merge request. The fix should arrive on GitHub in the next couple of days.