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-rw-r--r--changelog.d/10552.misc1
-rw-r--r--synapse/rest/client/v1/room.py4
2 files changed, 4 insertions, 1 deletions
diff --git a/changelog.d/10552.misc b/changelog.d/10552.misc
new file mode 100644
index 0000000000..fc5f6aea5f
--- /dev/null
+++ b/changelog.d/10552.misc
@@ -0,0 +1 @@
+Update `/batch_send` endpoint to only return `state_events` created by the `state_events_from_before` passed in.
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index b28b72bfbd..f1bc43be2d 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -437,6 +437,7 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
         prev_state_ids = list(prev_state_map.values())
         auth_event_ids = prev_state_ids
 
+        state_events_at_start = []
         for state_event in body["state_events_at_start"]:
             assert_params_in_dict(
                 state_event, ["type", "origin_server_ts", "content", "sender"]
@@ -502,6 +503,7 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
                 )
                 event_id = event.event_id
 
+            state_events_at_start.append(event_id)
             auth_event_ids.append(event_id)
 
         events_to_create = body["events"]
@@ -651,7 +653,7 @@ class RoomBatchSendEventRestServlet(TransactionRestServlet):
             event_ids.append(base_insertion_event.event_id)
 
         return 200, {
-            "state_events": auth_event_ids,
+            "state_events": state_events_at_start,
             "events": event_ids,
             "next_chunk_id": insertion_event["content"][
                 EventContentFields.MSC2716_NEXT_CHUNK_ID