Created a k8s cluster yesterday using Rancher 2.6.6 and while adding nodes to it, I have added the first one to be etcd, control plane abs worker node (all other nodes are working nodes only, this is dev environment). Now I want to remove worker label from the first node (so that it's only controlplane and etcd), but can't do it neither via Rancher management interface nor using kubectl label command. Any idea why?