Many thanks for creating this.
Just had an odd bug. I had all my docker apps setup nicely in folders with FolderView. This was after removing old DockerFolder and a reboot to be safe.
I installed a new docker app (adminer) onto my Unraid server, then added it to an existing folder (Database Services), but its now lost all other folders except the one I just updated. I tested it in multiple browsers and it was the same, just one folder. Added debug if it helps
debug-DOCKER.json
EDIT:
After the above, I tried to re-create one of the folders that were lost, by clicking Add Folder, then I decided to cancel and postpone till tomorrow instead. After starting and cancelling the process of adding a folder, i've now got all my original folders again, just in reverse chronological order