Not all New Folders are Shown after Folders are Added to the Live Folder

Current Situation

Not all new folders are shown in the JOC Cockpit folder tree after new folders are added to the live folder.
See the attached JobScheduler Log file.
In the situation recorded in the log file the folder test was duplicated as test-Kopie.
The error persisted after the JobScheduler was restarted.
Note that this error cannot be reliably reproduced - deletion of the _test-Kopie_folder followed creation of a new copy worked perfectly with all subfolders being shown in the folder tree.

Desired Behaviour

It should be possible to add new folders and to duplicate folders without errors occurring in processing the folder tree. In particular, this should be possible when JobScheduler objects of the same name occur in different folders.