diff --git a/lib/reducers/thread-reducer.js b/lib/reducers/thread-reducer.js
--- a/lib/reducers/thread-reducer.js
+++ b/lib/reducers/thread-reducer.js
@@ -58,12 +58,9 @@
 
 function generateOpsForThreadUpdates(
   threadInfos: RawThreadInfos,
-  payload: {
-    +updatesResult: { +newUpdates: $ReadOnlyArray<ClientUpdateInfo>, ... },
-    ...
-  },
+  newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
 ): $ReadOnlyArray<ThreadStoreOperation> {
-  return payload.updatesResult.newUpdates
+  return newUpdates
     .map(update =>
       updateSpecs[update.type].generateOpsForThreadUpdates?.(
         threadInfos,
@@ -241,7 +238,7 @@
     }
     const threadStoreOperations = generateOpsForThreadUpdates(
       state.threadInfos,
-      action.payload,
+      newUpdates,
     );
     const updatedThreadStore = processThreadStoreOperations(
       state,