If you rename a project ID in the projectmanager-edit panel the project list becomes empty.
When you restart the app all the projects re-appear and the new project ID is in the list.
It was a bit scary, until a restart brought all my projects back.
egroupware-docker (19.1.20191119) hardy; urgency=low
Ubuntu SMP Thu Nov 7 16:15:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
PHP Version 7.3.11-1+ubuntu18.04.1+deb.sury.org+1