While testing update via UI for 5.5.0 to 188.8.131.52, noticed that openidm stops but is not restarted. Reproduced in 6.0.0-M5 via REST:
There are no exceptions in the logs.
From code inspection, it appears that we issue the restart in UpdateManager but OSGI fails to restart the instance.
This issue prevents a restart of openidm during upgrade 5.5 to 184.108.40.206 but I did not test that particular (upgrade) use case here. I presume it would fail, as well.