"kustomize.toolkit.fluxcd.io/ssa: IfNotPresent" not working?

[ntx-ben]

I'm running version 2.4.0 of flux and have 2 services that both define the same namespace in their definitions. I added the kustomize.toolkit.fluxcd.io/ssa: IfNotPresent annotation to both namespace resources, however I noticed that it seems to be ignored by flux when reconciling the services; the namespace keeps getting SSA'd in the cluster by its respective service at every reconciliation.

service1/namespace.yaml

apiVersion: v1
kind: Namespace
metadata:
  anotations:
    kustomize.toolkit.fluxcd.io/ssa: IfNotPresent
  name: my-ns

service2/namespace.yaml

apiVersion: v1
kind: Namespace
metadata:
  anotations:
    kustomize.toolkit.fluxcd.io/ssa: IfNotPresent
  name: my-ns

kustomize-controller logs:

{"level":"info","ts":"2025-01-27T15:54:50.192Z","msg":"server-side apply for cluster definitions completed","controller":"kustomization","controllerGroup":"kustomize.toolkit.fluxcd.io","controllerKind":"Kustomization","Kustomization":{"name":"service1","namespace":"flux-system"},"namespace":"flux-system","name":"service1","reconcileID":"69dfe54f-9d6e-44c9-bbf8-b2b2e29cb335","output":{"Namespace/my-ns":"configured"}}

(a few moments later)

{"level":"info","ts":"2025-01-27T15:56:41.576Z","msg":"server-side apply for cluster definitions completed","controller":"kustomization","controllerGroup":"kustomize.toolkit.fluxcd.io","controllerKind":"Kustomization","Kustomization":{"name":"service2","namespace":"flux-system"},"namespace":"flux-system","name":"service2","reconcileID":"e5125c92-88fa-437e-9857-170465b63ab9","output":{"Namespace/my-ns":"configured"}}

Could anyone tell me what I'm missing? Unless I got this wrong; my assumption is that if service1 first applies the namespace, then service2 should not apply it given the annotation to ignore it when it exists?