I reported this issue to LT, hopefully something can be done, it's strange because it works for most people, but there are at least 3 cases I know of that where it is not working.
Note that rsync creates all the folders before the transfer, so they will all be in the first available disk, and depending on the split level all data can go there.
Yes, just removing the *.plg files will prevent them from loading, but you can also delete the respective folders if you don't care about the settings for those plugins.
Please uninstall these and see if there's any difference:
docker.folder.plg - 2021.08.20 (Up to date) (Incompatible)
NerdPack.plg - 2021.08.11 (Up to date) (Incompatible)
Looks OK, but that won't fix the current libvirt.img issue, only if you restore a backup, or need to re-create the VM(s), can still point to the same vdisk(s).