fix: read a location's subnet range from spec when status is absent

internal/controller/networkcontext_controller.go

@@ -118,16 +118,30 @@ func (r *NetworkContextReconciler) networksForContext(
 		if subnet.Spec.NetworkContext.Name != networkContext.Name {
 			continue
 		}
-		if subnet.Status.StartAddress == nil || subnet.Status.PrefixLength == nil {
+		start, prefixLength, ok := subnetRange(&subnet)
+		if !ok {
 			continue
 		}
 		networks = append(networks, cloudv1alpha1.Network(
-			fmt.Sprintf("%s/%d", *subnet.Status.StartAddress, *subnet.Status.PrefixLength)))
+			fmt.Sprintf("%s/%d", start, prefixLength)))
 	}
 	slices.Sort(networks)
 	return networks, nil
 }
 
+// subnetRange reads a subnet's allocated range, preferring status and falling
+// back to spec. A location's copy arrives by propagation, which carries spec
+// and never status.
+func subnetRange(subnet *networkingv1alpha.Subnet) (string, int32, bool) {
+	if subnet.Status.StartAddress != nil && subnet.Status.PrefixLength != nil {
+		return *subnet.Status.StartAddress, *subnet.Status.PrefixLength, true
+	}
+	if subnet.Spec.StartAddress != "" && subnet.Spec.PrefixLength != 0 {
+		return subnet.Spec.StartAddress, subnet.Spec.PrefixLength, true
+	}
+	return "", 0, false
+}
+
 // allocateVPCIdentifier draws a random 48-bit identifier not already in use.
 // A single leader-elected controller is the only writer, so a list plus a
 // collision check serializes correctly.

internal/controller/networkcontext_controller_test.go

@@ -0,0 +1,52 @@
+/*
+Copyright © 2026 Datum Technology, Inc. All rights reserved.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package controller
+
+import (
+	"testing"
+
+	networkingv1alpha "go.datum.net/network-services-operator/api/v1alpha"
+)
+
+// A location's Subnet arrives by propagation, which carries spec and never
+// status, so the allocated range has to be readable from either.
+func TestSubnetRangePrefersStatusAndFallsBackToSpec(t *testing.T) {
+	start := "fd00::"
+	var length int32 = 48
+
+	withStatus := &networkingv1alpha.Subnet{
+		Spec:   networkingv1alpha.SubnetSpec{StartAddress: "fd20::", PrefixLength: 64},
+		Status: networkingv1alpha.SubnetStatus{StartAddress: &start, PrefixLength: &length},
+	}
+	gotStart, gotLength, ok := subnetRange(withStatus)
+	if !ok || gotStart != "fd00::" || gotLength != 48 {
+		t.Fatalf("status should win when present, got %q/%d ok=%v", gotStart, gotLength, ok)
+	}
+
+	specOnly := &networkingv1alpha.Subnet{
+		Spec: networkingv1alpha.SubnetSpec{StartAddress: "fd20::", PrefixLength: 64},
+	}
+	gotStart, gotLength, ok = subnetRange(specOnly)
+	if !ok || gotStart != "fd20::" || gotLength != 64 {
+		t.Fatalf("a propagated copy carries spec only, got %q/%d ok=%v", gotStart, gotLength, ok)
+	}
+
+	if _, _, ok := subnetRange(&networkingv1alpha.Subnet{}); ok {
+		t.Fatal("an unallocated subnet should yield nothing")
+	}
+}