Merge pull request #7035 from matrix-org/babolivier/hide_dummy_events

Hide extremities dummy events from clients

changelog.d/7035.bugfix

@@ -0,0 +1 @@
+Fix a bug causing `org.matrix.dummy_event` to be included in responses from `/sync`.

synapse/visibility.py

@@ -119,6 +119,9 @@ def filter_events_for_client(
 
                the original event if they can see it as normal.
         """
+        if event.type == "org.matrix.dummy_event":
+            return None
+
         if not event.is_state() and event.sender in ignore_list:
             return None