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-rw-r--r--synapse/handlers/message.py10
1 files changed, 6 insertions, 4 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 66e40a915d..b960e18c4c 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1594,11 +1594,13 @@ class EventCreationHandler:
         for k, v in original_event.internal_metadata.get_dict().items():
             setattr(builder.internal_metadata, k, v)
 
-        # the event type hasn't changed, so there's no point in re-calculating the
-        # auth events.
+        # modules can send new state events, so we re-calculate the auth events just in
+        # case.
+        prev_event_ids = await self.store.get_prev_events_for_room(builder.room_id)
+
         event = await builder.build(
-            prev_event_ids=original_event.prev_event_ids(),
-            auth_event_ids=original_event.auth_event_ids(),
+            prev_event_ids=prev_event_ids,
+            auth_event_ids=None,
         )
 
         # we rebuild the event context, to be on the safe side. If nothing else,