diff --git a/lib/reducers/message-reducer.js b/lib/reducers/message-reducer.js
--- a/lib/reducers/message-reducer.js
+++ b/lib/reducers/message-reducer.js
@@ -924,6 +924,12 @@
       messageStoreOperations,
     );
 
+    assertMessageStoreThreadsAreEqual(
+      processedMessageStore,
+      filteredMessageStore,
+      action.type,
+    );
+
     return {
       messageStoreOperations,
       messageStore: {