The service deployed on k3d-mycluster-server-0 cannot be accessed through the port mapping of k3d-mycluster-serverlb

[HobbyBear]

k3d-mycluster-serverlb set up port mapping, and then I deployed grafana to the cluster, and found that the local machine can not access the grafana instance of k3d-mycluster-server-0 through port mapping, but can access k3d-mycluster-agent-0 Grafana instance on node, is this a bug？