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-rw-r--r--synapse/storage/databases/main/events.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 1a322882bf..1f60aef180 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -1814,7 +1814,10 @@ class PersistEventsStore:
         if rel_type == RelationTypes.REPLACE:
             txn.call_after(self.store.get_applicable_edit.invalidate, (parent_id,))
 
-        if rel_type == RelationTypes.THREAD:
+        if (
+            rel_type == RelationTypes.THREAD
+            or rel_type == RelationTypes.UNSTABLE_THREAD
+        ):
             txn.call_after(self.store.get_thread_summary.invalidate, (parent_id,))
             # It should be safe to only invalidate the cache if the user has not
             # previously participated in the thread, but that's difficult (and