fix review

Signed-off-by: Patrik Cyvoct <patrik@ptrk.io>

pkg/registry/core/service/strategy.go

@@ -179,6 +179,12 @@ func dropServiceDisabledFields(newSvc *api.Service, oldSvc *api.Service) {
 	if !utilfeature.DefaultFeatureGate.Enabled(features.ServiceTopology) && !topologyKeysInUse(oldSvc) {
 		newSvc.Spec.TopologyKeys = nil
 	}
+
+	if !utilfeature.DefaultFeatureGate.Enabled(features.LoadBalancerIPMode) && !loadbalancerIPModeInUse(oldSvc) {
+		for _, ing := range newSvc.Status.LoadBalancer.Ingress {
+			ing.IPMode = nil
+		}
+	}
 }
 
 // returns true if svc.Spec.ServiceIPFamily field is in use
@@ -202,6 +208,19 @@ func topologyKeysInUse(svc *api.Service) bool {
 	return len(svc.Spec.TopologyKeys) > 0
 }
 
+// returns true is svc.Status.LoadBalancer.Ingress[].IPMode fields are in use
+func loadbalancerIPModeInUse(svc *api.Service) bool {
+	if svc == nil {
+		return false
+	}
+	for _, ing := range svc.Status.LoadBalancer.Ingress {
+		if ing.IPMode != nil {
+			return true
+		}
+	}
+	return false
+}
+
 type serviceStatusStrategy struct {
 	Strategy
 }