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-rw-r--r--synapse/storage/databases/main/events.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 1f60aef180..d253243125 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -1745,6 +1745,13 @@ class PersistEventsStore:
                 (event.state_key,),
             )
 
+            # The `_get_membership_from_event_id` is immutable, except for the
+            # case where we look up an event *before* persisting it.
+            txn.call_after(
+                self.store._get_membership_from_event_id.invalidate,
+                (event.event_id,),
+            )
+
             # We update the local_current_membership table only if the event is
             # "current", i.e., its something that has just happened.
             #