I’ve never seen or needed to use a serversideapply in kubernetes before, but I ran into this same issue in my k3s homelab while installing cloudnative-pg.
You can do it with argo
apiVersion: argoproj.io/v1alpha1
kind: Application
spec:
syncPolicy:
syncOptions:
- ServerSideApply=true
and you can do it with kubectl
kubectl apply --server-side --force-conflicts -f cnpg-1.25.0.yaml