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-rw-r--r--synapse/handlers/federation.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 8e2cf3387a..a03d77dffd 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -593,6 +593,13 @@ class FederationHandler(BaseHandler):
             target_hosts, room_id, knockee, Membership.KNOCK, content, params=params
         )
 
+        # Mark the knock as an outlier as we don't yet have the state at this point in
+        # the DAG.
+        event.internal_metadata.outlier = True
+
+        # ... but tell /sync to send it to clients anyway.
+        event.internal_metadata.out_of_band_membership = True
+
         # Record the room ID and its version so that we have a record of the room
         await self._maybe_store_room_on_outlier_membership(
             room_id=event.room_id, room_version=event_format_version