Fix ownerRef setting bug

test/infrastructure/docker/exp/internal/controllers/dockermachinepool_controller_phases.go

@@ -144,7 +144,7 @@ func (r *DockerMachinePoolReconciler) reconcileDockerMachines(ctx context.Contex
 	// Providers should iterate through their infrastructure instances and ensure that each instance has a corresponding InfraMachine.
 	for _, machine := range externalMachines {
 		if existingMachine, ok := dockerMachineMap[machine.Name()]; ok {
-			log.V(4).Info("Patching existing DockerMachine", "name", existingMachine.Name)
+			log.V(2).Info("Patching existing DockerMachine", "name", existingMachine.Name)
 			desiredMachine := computeDesiredDockerMachine(machine.Name(), cluster, machinePool, dockerMachinePool, &existingMachine)
 			if err := ssa.Patch(ctx, r.Client, dockerMachinePoolControllerName, desiredMachine, ssa.WithCachingProxy{Cache: r.ssaCache, Original: &existingMachine}); err != nil {
 				return errors.Wrapf(err, "failed to update DockerMachine %q", klog.KObj(desiredMachine))
@@ -258,16 +258,17 @@ func computeDesiredDockerMachine(name string, cluster *clusterv1.Cluster, machin
 	}
 
 	if existingDockerMachine != nil {
-		dockerMachine = existingDockerMachine
+		dockerMachine.SetUID(existingDockerMachine.UID)
+		dockerMachine.SetOwnerReferences(existingDockerMachine.OwnerReferences)
 	}
 
 	// Note: Since the MachinePool controller has not created its owner Machine yet, we want to set the DockerMachinePool as the owner so it's not orphaned.
-	util.EnsureOwnerRef(dockerMachine.OwnerReferences, metav1.OwnerReference{
+	dockerMachine.SetOwnerReferences(util.EnsureOwnerRef(dockerMachine.OwnerReferences, metav1.OwnerReference{
 		APIVersion: dockerMachinePool.APIVersion,
 		Kind:       dockerMachinePool.Kind,
 		Name:       dockerMachinePool.Name,
 		UID:        dockerMachinePool.UID,
-	})
+	}))
 	dockerMachine.Labels[clusterv1.ClusterNameLabel] = cluster.Name
 	dockerMachine.Labels[clusterv1.MachinePoolNameLabel] = format.MustFormatValue(machinePool.Name)