If they exist, please try the following on the node to reconstruct the `rke2.yaml`:

SERVER_CA=$(cat /var/lib/rancher/rke2/server/tls/server-ca.crt | base64 -w 0)
CLIENT_KEY=$(cat /var/lib/rancher/rke2/server/tls/client-admin.key | base64 -w 0)
CLIENT_CERT=$(cat /var/lib/rancher/rke2/server/tls/client-admin.crt | base64 -w 0)
cat <<EOF > rke2.yaml
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ${SERVER_CA}
    server: <https://127.0.0.1:6443>
  name: default
contexts:
- context:
    cluster: default
    user: default
  name: default
current-context: default
kind: Config
preferences: {}
users:
- name: default
  user:
    client-certificate-data: ${CLIENT_CERT}
    client-key-data: ${CLIENT_KEY}
EOF

The above script will result in a

rke2.yaml

file under the current directory. See if that works by:

KUBECONFIG=rke2.yaml kubectl get nodes