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
@@ -86,12 +86,7 @@
   // Only allow checkpoints to increase if we are connected
   // or if the action is a STATE_SYNC
   const { messageStoreOperations, messageStore: reducedMessageStore } =
-    reduceMessageStore(
-      state.messageStore,
-      action,
-      threadInfos,
-      onStateDifferenceForStaff,
-    );
+    reduceMessageStore(state.messageStore, action, threadInfos);
   let messageStore = reducedMessageStore;
 
   let { keyserverStore, keyserverStoreOperations } = reduceKeyserverStore(
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
@@ -110,9 +110,7 @@
   type ClientUpdateInfo,
   processUpdatesActionType,
 } from '../types/update-types.js';
-import { getMessageForException } from '../utils/errors.js';
 import { translateClientDBThreadMessageInfos } from '../utils/message-ops-utils.js';
-import { assertObjectsAreEqual } from '../utils/objects.js';
 
 const _mapValuesWithKeys = _mapValues.convert({ cap: false });
 
@@ -145,31 +143,6 @@
   );
 }
 
-function assertMessageStoreLocalMessageInfosAreEqual(
-  processedMessageStore: MessageStore,
-  expectedMessageStore: MessageStore,
-  location: string,
-  onStateDifference?: (message: string) => mixed,
-) {
-  try {
-    assertObjectsAreEqual(
-      processedMessageStore.local,
-      expectedMessageStore.local,
-      `MessageStore.local - ${location}`,
-    );
-  } catch (e) {
-    console.log(
-      'Error processing MessageStore local ops',
-      processedMessageStore.local,
-      expectedMessageStore.local,
-    );
-    const message = `Error processing MessageStore local ops ${
-      getMessageForException(e) ?? '{no exception message}'
-    }`;
-    onStateDifference?.(message);
-  }
-}
-
 const newThread = (): ThreadMessageInfo => ({
   messageIDs: [],
   startReached: false,
@@ -778,7 +751,6 @@
   messageStore: MessageStore,
   action: BaseAction,
   newThreadInfos: RawThreadInfos,
-  onStateDifference?: (message: string) => mixed,
 ): ReduceMessageStoreResult {
   if (
     action.type === legacyLogInActionTypes.success ||
@@ -1687,16 +1659,6 @@
     const actionPayloadMessageStoreLocalMessageInfos =
       action.payload.messageStoreLocalMessageInfos ?? {};
 
-    assertMessageStoreLocalMessageInfosAreEqual(
-      {
-        ...messageStore,
-        local: actionPayloadMessageStoreLocalMessageInfos,
-      },
-      messageStore,
-      action.type,
-      onStateDifference,
-    );
-
     const newThreads: {
       [threadID: string]: ThreadMessageInfo,
     } = { ...messageStore.threads };
@@ -1711,7 +1673,11 @@
     if (!payloadMessages) {
       return {
         messageStoreOperations: [],
-        messageStore: { ...messageStore, threads: newThreads },
+        messageStore: {
+          ...messageStore,
+          threads: newThreads,
+          local: actionPayloadMessageStoreLocalMessageInfos,
+        },
       };
     }