Try and drop stale extremities. (#8929)

If we see stale extremities while persisting events, and notice that
they don't change the result of state resolution, we drop them.

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py

index 2b8aa9443d..9dfeab09cd 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1261,7 +1261,7 @@ class EventCreationHandler:
                 event, context = await self.create_event(
                     requester,
                     {
-                        "type": "org.matrix.dummy_event",
+                        "type": EventTypes.Dummy,
                         "content": {},
                         "room_id": room_id,
                         "sender": user_id,