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-rw-r--r--synapse/event_auth.py20
1 files changed, 14 insertions, 6 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index 4d6d1b8ebd..813ef00ceb 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -168,13 +168,21 @@ async def check_state_independent_auth_rules(
         return
 
     # 2. Reject if event has auth_events that: ...
-    auth_events = await store.get_events(
-        event.auth_event_ids(),
-        redact_behaviour=EventRedactBehaviour.as_is,
-        allow_rejected=True,
-    )
     if batched_auth_events:
-        auth_events.update(batched_auth_events)
+        auth_event_ids = event.auth_event_ids()
+        auth_events = dict(batched_auth_events)
+        if set(auth_event_ids) - batched_auth_events.keys():
+            auth_events.update(
+                await store.get_events(
+                    set(auth_event_ids) - batched_auth_events.keys()
+                )
+            )
+    else:
+        auth_events = await store.get_events(
+            event.auth_event_ids(),
+            redact_behaviour=EventRedactBehaviour.as_is,
+            allow_rejected=True,
+        )
 
     room_id = event.room_id
     auth_dict: MutableStateMap[str] = {}