Thank you for your answer, I’ll update the Github Issue, maybe one of the developers has an idea.
I experienced similar issue with Ceph store. If I undeploy VM on the same node as sunstone, I get an error. In the logs Openenbula is trying to copy instance metadata on the same host over ssh as quoted in https://forum.opennebula.io/t/error-during-undeploy/6026/13. If I have VM on the different node from sunstone then undeploy works. I opened an issue #3010 in github but no takers yet.