Starting from Common Image v9.5.27 (ZD #33260) or v9.5.28 (JIRA #ST-4375), Docker daemon required should be >= 20.10.10
In case you upgrade your common image to 9.5.28 and have Docker < 20.10.10, you will experience a translation = source behavior.
At container level, error is:
RuntimeError: boost::filesystem::status: Operation not permitted [system:1]
To upgrade docker:
systemctl stop systran-translation-resource-monitor.serviceyum update docker
systemctl start systran-translation-resource-monitor.service