That suggests something in your /config is causing the issue, you can backup the current flash drive first and then redo it and just restore the bare minimum, like the key, super.dat and the pools folder for the assignments, also copy the docker user templates folder, if all works you can then reconfigure the server or try restoring a few config files at a time from the backup to see if you can find the culprit.
I followed this first but still couldn't assign disks then went with the backup not thinking.