diff --git a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/client_test.go b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/client_test.go
index 342ecb2d..8f99c5db 100644
--- a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/client_test.go
+++ b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/client_test.go
@@ -703,3 +703,23 @@ func TestNatsResticsFilesFillFromTheBackupPlacement(t *testing.T) {
 	b.assign(t, "restic", plan("# a\n/srv/a\n", "# a\nstate\n"))
 	eventually(t, "a module taken away refills backups.conf", func() bool { return e.read(t, backups) == head+"# a\n/srv/a\n" })
 }
+
+// defaults writes the defaults a module's manifest declares as mesh-config resolves them (source default), for a
+// moved module whose templates read config values (issue 1780).
+func (b *aBus) defaults(t *testing.T, module string, manifest []byte) {
+	t.Helper()
+	var m struct {
+		Config map[string]struct {
+			Default json.RawMessage `json:"default"`
+		} `json:"config"`
+	}
+	if err := json.Unmarshal(manifest, &m); err != nil {
+		t.Fatal(err)
+	}
+	for key, d := range m.Config {
+		if len(d.Default) > 0 && string(d.Default) != "null" {
+			b.put(t, ConfigBucket, node+"."+module+"."+key, fmt.Sprintf(`{"node":%q,"module":%q,"key":%q,"value":%s,`+
+				`"source":"default"}`, node, module, key, d.Default))
+		}
+	}
+}
diff --git a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/environment_test.go b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/environment_test.go
index 25b4e88e..ae455c35 100644
--- a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/environment_test.go
+++ b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/environment_test.go
@@ -158,6 +158,7 @@ func TestNatsTheEnvironmentOfTheCataloguesModulesIsWhatTheOldFormComposed(t *tes
 				if !manifest.Moved || len(manifest.Items) == 0 {
 					t.Fatalf("%s is not a moved contributor of items", m)
 				}
+				b.defaults(t, m, read(m+"/module.json"))
 				texts := map[string]string{}
 				var planned []PlannedItem
 				for _, it := range manifest.Items {
diff --git a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/xorg_golden_test.go b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/xorg_golden_test.go
index 2f99d55b..fabc35ac 100644
--- a/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/xorg_golden_test.go
+++ b/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/xorg_golden_test.go
@@ -63,6 +63,7 @@ func TestNatsTheSessionFilesFilledFromTheirContributorsItemsAreWhatTheOldFormCom
 				if !c.Moved || len(c.Shell) != 0 {
 					t.Fatalf("%s is not moved or still holds shell entries", m)
 				}
+				b.defaults(t, m, []byte(read(m+"/module.json")))
 				texts := map[string]string{}
 				var planned []PlannedItem
 				for _, it := range c.Items {