K3s rancher proxy

Hi,
I’ve imported a K3S cluster into Rancher 2.2.2 and I’ve noticed that accessing a service through a proxy (https://my-rancher-ha-cluster/k8s/clusters/clusterid/api/v1/namespaces/my-namespace/services/http:my-service:containerport/proxy/)
the Host header is different for K3S than a rke cluster.
K3s: Host: localhost:6443
RKE: Host: my-rancher-ha-cluster

Maybe a bug?