1 files changed, 8 insertions, 0 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index e5967c995e..05219a9dd0 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -435,6 +435,14 @@ class EventClientSerializer:
             serialized_event: The serialized event which may be modified.
 
         """
+        # Do not bundle relations for an event which represents an edit or an
+        # annotation. It does not make sense for them to have related events.
+        relates_to = event.content.get("m.relates_to")
+        if isinstance(relates_to, (dict, frozendict)):
+            relation_type = relates_to.get("rel_type")
+            if relation_type in (RelationTypes.ANNOTATION, RelationTypes.REPLACE):
+                return
+
         event_id = event.event_id
 
         # The bundled relations to include.