No, we use single architecture for all the processes. Our software works fine with Ubuntu 14.04 (i386 and amd64 versions) and Debian 9 (amd64). Only Denian 9 i386 has this problem. Problem reproduced with Docker i386 container too. At the first time problem has been found in the Docker image, so I thought it caused by running i386 image over amd64 kernel, but installing to the i686 old hardware directly reproduces the problem.
I'll prepare i386 docker image for Debian Buster as soon as I can and check the problem there.