diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 0a13673b06..2ca65fc8d7 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -933,7 +933,7 @@ class EventCreationHandler:
                     event.internal_metadata.stream_ordering = stream_id
                 return event
 
-            event, stream_id = await self.persist_and_notify_client_event(
+            event = await self.persist_and_notify_client_event(
                 requester, event, context, ratelimit=ratelimit, extra_users=extra_users
             )
 
@@ -982,11 +982,16 @@ class EventCreationHandler:
         context: EventContext,
         ratelimit: bool = True,
         extra_users: List[UserID] = [],
-    ) -> Tuple[EventBase, int]:
+    ) -> EventBase:
         """Called when we have fully built the event, have already
         calculated the push actions for the event, and checked auth.
 
         This should only be run on the instance in charge of persisting events.
+
+        Returns:
+            The persisted event. This may be different than the given event if
+            it was de-duplicated (e.g. because we had already persisted an
+            event with the same transaction ID.)
         """
         assert self.storage.persistence is not None
         assert self._events_shard_config.should_handle(
@@ -1181,7 +1186,7 @@ class EventCreationHandler:
             # matters as sometimes presence code can take a while.
             run_in_background(self._bump_active_time, requester.user)
 
-        return event, event_pos.stream
+        return event
 
     async def _bump_active_time(self, user: UserID) -> None:
         try:
diff --git a/synapse/replication/http/send_event.py b/synapse/replication/http/send_event.py
index 0eda680a32..36ba6b1c92 100644
--- a/synapse/replication/http/send_event.py
+++ b/synapse/replication/http/send_event.py
@@ -116,14 +116,17 @@ class ReplicationSendEventRestServlet(ReplicationEndpoint):
             "Got event to send with ID: %s into room: %s", event.event_id, event.room_id
         )
 
-        (
-            event,
-            stream_id,
-        ) = await self.event_creation_handler.persist_and_notify_client_event(
+        event = await self.event_creation_handler.persist_and_notify_client_event(
             requester, event, context, ratelimit=ratelimit, extra_users=extra_users
         )
 
-        return 200, {"stream_id": stream_id, "event_id": event.event_id}
+        return (
+            200,
+            {
+                "stream_id": event.internal_metadata.stream_ordering,
+                "event_id": event.event_id,
+            },
+        )
 
 
 def register_servlets(hs, http_server):