CSIMigration failed due to missing csi flags

[syjabri]

What happened:
I want to migrate from the openstack in-tree to the external cloud provider using kubeone, the migration part is not done and the volumes still point to the old in-tree cloud provider.

What is the expected behavior:
After enabling csimigration, an additional feature-gates field should be added to the controller-manager and apiserver "CSIMigration=true,CSIMigrationOpenStack=true,ExpandCSIVolumes=true".
And after the migration is done, an annotation should be automatically added to the persistent volume pv.kubernetes.io/migrated-to: cinder.csi.openstack.org, also the --cloud-provider=external and --cloud-config fields should be removed from the kubeadm flag file.
How to reproduce the issue:

1. Add the external field in the kubeone.yaml configuration file as mentioned here

cloudProvider:
    openstack: {}
    external: true

2. Then run kubeone upgrade --force
3. An openstack-cloud-controller-manager is deployed in the kube-system namespace
4. After that deploy the Cinder CSI Plugin manually.
5. Added csiMigration: true in the kubeone configuration file .
6. Re-Run kubeone upgrade --force

Information about the environment:
KubeOne version (kubeone version): v1.2.1
Operating system: Flatcar
Provider you're deploying cluster on: Openstack

[kron4eg]

Unfortunately the feature you are looking for (you can track it here #616) was never implemented in the first place, so it can't be a bug. Closing as "duplicate".