when converting MAPI MachineSet status to CAPI, capi mahcineset status.selector is empty. 

4.21.0-0.nightly-2025-10-15-162146

Always 

1. Create a mapi authority mapi machineset, add label to spec.selector.matchLabels and spec.template.metadata.labels

2. Waiting for machine running
3. Check capi machineset status $ oc get machineset.c huliu-aws1017a-wswz9-worker-us-east-2cc -o yaml                                                                                                  [14:48:51]
apiVersion: cluster.x-k8s.io/v1beta1
kind: MachineSet
metadata:
  annotations:
    capacity.cluster-autoscaler.kubernetes.io/labels: kubernetes.io/arch=amd64
    cluster.x-k8s.io/paused: ""
    machine.openshift.io/GPU: "0"
    machine.openshift.io/memoryMb: "16384"
    machine.openshift.io/vCPU: "4"
  creationTimestamp: "2025-10-17T06:43:18Z"
  finalizers:
  - cluster.x-k8s.io/machineset
  - sync.machine.openshift.io/finalizer
  generation: 1
  labels:
    cluster.x-k8s.io/cluster-name: huliu-aws1017a-wswz9
    machine.openshift.io/cluster-api-cluster: huliu-aws1017a-wswz9
  name: huliu-aws1017a-wswz9-worker-us-east-2cc
  namespace: openshift-cluster-api
  ownerReferences:
  - apiVersion: cluster.x-k8s.io/v1beta1
    blockOwnerDeletion: true
    controller: false
    kind: Cluster
    name: huliu-aws1017a-wswz9
    uid: dbdb2a21-0820-43c1-a622-ca7427035d1d
  resourceVersion: "156263"
  uid: 56122bed-5ba8-4027-952f-c74d24791d93
spec:
  clusterName: huliu-aws1017a-wswz9
  deletePolicy: Random
  replicas: 1
  selector:
    matchLabels:
      aa: bb
      machine.openshift.io/cluster-api-cluster: huliu-aws1017a-wswz9
      machine.openshift.io/cluster-api-machineset: huliu-aws1017a-wswz9-worker-us-east-2cc
  template:
    metadata:
      labels:
        aa: bb
        cluster.x-k8s.io/cluster-name: huliu-aws1017a-wswz9
        machine.openshift.io/cluster-api-cluster: huliu-aws1017a-wswz9
        machine.openshift.io/cluster-api-machineset: huliu-aws1017a-wswz9-worker-us-east-2cc
        node-role.kubernetes.io/worker: ""
    spec:
      bootstrap:
        dataSecretName: worker-user-data
      clusterName: huliu-aws1017a-wswz9
      failureDomain: us-east-2c
      infrastructureRef:
        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
        kind: AWSMachineTemplate
        name: huliu-aws1017a-wswz9-worker-us-east-2cc-fba67cd6
        namespace: openshift-cluster-api
      nodeDeletionTimeout: 10s
status:
  availableReplicas: 1
  conditions:
  - lastTransitionTime: "2025-10-17T06:46:38Z"
    status: "True"
    type: Ready
  - lastTransitionTime: "2025-10-17T06:43:19Z"
    status: "True"
    type: MachinesCreated
  - lastTransitionTime: "2025-10-17T06:46:38Z"
    status: "True"
    type: MachinesReady
  - lastTransitionTime: "2025-10-17T06:43:19Z"
    status: "True"
    type: Resized
  fullyLabeledReplicas: 1
  observedGeneration: 1
  readyReplicas: 1
  replicas: 1
  v1beta2:
    availableReplicas: 1
    conditions:
    - lastTransitionTime: "2025-10-17T06:43:19Z"
      message: ""
      observedGeneration: 1
      reason: NotScalingDown
      status: "False"
      type: ScalingDown
    - lastTransitionTime: "2025-10-17T06:43:19Z"
      message: ""
      observedGeneration: 1
      reason: NotScalingUp
      status: "False"
      type: ScalingUp
    - lastTransitionTime: "2025-10-17T06:46:38Z"
      message: ""
      observedGeneration: 1
      reason: Ready
      status: "True"
      type: MachinesReady
    - lastTransitionTime: "2025-10-17T06:43:19Z"
      message: ""
      observedGeneration: 1
      reason: UpToDate
      status: "True"
      type: MachinesUpToDate
    - lastTransitionTime: "2025-10-17T06:43:18Z"
      message: MachineSet has the cluster.x-k8s.io/paused annotation
      observedGeneration: 1
      reason: Paused
      status: "True"
      type: Paused
    - lastTransitionTime: "2025-10-17T06:43:19Z"
      message: ""
      observedGeneration: 1
      reason: NotDeleting
      status: "False"
      type: Deleting
    readyReplicas: 1
    upToDateReplicas: 0

CAPI machineset status no selector

Set selector in capi machineset

Create a capi machineset,then create same name mapi machineset,I can see selector in capi machineset.
Create mapi machineset with capi authority, selector can be seen in capi machineset status.

  selector: cluster.x-k8s.io/cluster-name=zhsunaws-hwqmt,machine.openshift.io/cluster-api-cluster=zhsunaws-hwqmt,machine.openshift.io/cluster-api-machineset=zhsunaws-hwqmt-worker-us-east-2aa