diff --git a/lib/reducers/master-reducer.js b/lib/reducers/master-reducer.js
--- a/lib/reducers/master-reducer.js
+++ b/lib/reducers/master-reducer.js
@@ -38,6 +38,7 @@
   keyserverStoreOpsHandlers,
   type ReplaceKeyserverOperation,
 } from '../ops/keyserver-store-ops.js';
+import { syncedMetadataStoreOpsHandlers } from '../ops/synced-metadata-store-ops.js';
 import { isStaff } from '../shared/staff-utils.js';
 import { processDMOpsActionType } from '../types/dm-ops.js';
 import type { BaseNavInfo } from '../types/nav-types.js';
@@ -180,17 +181,34 @@
     threadStoreOperations,
   );
 
-  const { enabledApps } = reduceEnabledApps(state.enabledApps, action);
+  const { enabledApps, syncedMetadataStoreOperations: enabledAppsOps } =
+    reduceEnabledApps(state.enabledApps, action);
 
-  const { globalThemeInfo } = reduceGlobalThemeInfo(
-    state.globalThemeInfo,
-    action,
-  );
+  const { globalThemeInfo, syncedMetadataStoreOperations: globalThemeInfoOps } =
+    reduceGlobalThemeInfo(state.globalThemeInfo, action);
 
-  const { alertStore } = reduceAlertStore(state.alertStore, action);
+  const { alertStore, syncedMetadataStoreOperations: alertStoreOps } =
+    reduceAlertStore(state.alertStore, action);
 
-  const { syncedMetadataStore, syncedMetadataStoreOperations } =
-    reduceSyncedMetadataStore(state.syncedMetadataStore, action);
+  const predefinedSyncedMetadataStoreOperations = [
+    ...enabledAppsOps,
+    ...globalThemeInfoOps,
+    ...alertStoreOps,
+  ];
+  const updatedSyncedMetadataStore =
+    syncedMetadataStoreOpsHandlers.processStoreOperations(
+      state.syncedMetadataStore,
+      predefinedSyncedMetadataStoreOperations,
+    );
+  const {
+    syncedMetadataStore,
+    syncedMetadataStoreOperations: syncedMetadataStoreOperationsFromReducer,
+  } = reduceSyncedMetadataStore(updatedSyncedMetadataStore, action);
+
+  const syncedMetadataStoreOperations = [
+    ...predefinedSyncedMetadataStoreOperations,
+    ...syncedMetadataStoreOperationsFromReducer,
+  ];
 
   const { auxUserStore, auxUserStoreOperations } = reduceAuxUserStore(
     state.auxUserStore,