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
@@ -1005,14 +1005,15 @@
           lastPruned: thread?.lastPruned ?? now,
         },
       };
-
-      const newMessageStore = { ...messageStore, messages, threads, local };
-      assertMessageStoreMessagesAreEqual(
-        processedMessageStore,
-        newMessageStore,
-        action.type,
-      );
-      return { messageStoreOperations, messageStore: newMessageStore };
+      return {
+        messageStoreOperations,
+        messageStore: {
+          ...messageStore,
+          messages: processedMessageStore.messages,
+          threads,
+          local,
+        },
+      };
     }
 
     for (const existingMessageID of messageIDs) {
@@ -1034,26 +1035,18 @@
           lastPruned: now,
         };
 
-    const newMessageStore = {
-      messages: {
-        ...messageStore.messages,
-        [localID]: payload,
-      },
-      threads: {
-        ...messageStore.threads,
-        [threadID]: threadState,
+    return {
+      messageStoreOperations,
+      messageStore: {
+        messages: processedMessageStore.messages,
+        threads: {
+          ...messageStore.threads,
+          [threadID]: threadState,
+        },
+        local: messageStore.local,
+        currentAsOf: messageStore.currentAsOf,
       },
-      local: messageStore.local,
-      currentAsOf: messageStore.currentAsOf,
     };
-
-    assertMessageStoreMessagesAreEqual(
-      processedMessageStore,
-      newMessageStore,
-      action.type,
-    );
-
-    return { messageStoreOperations, messageStore: newMessageStore };
   } else if (
     action.type === sendTextMessageActionTypes.failed ||
     action.type === sendMultimediaMessageActionTypes.failed