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-rw-r--r--synapse/storage/event_federation.py11
1 files changed, 6 insertions, 5 deletions
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index 6c559f8f63..ced066f407 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -177,14 +177,15 @@ class EventFederationStore(SQLBaseStore):
             retcols=["prev_event_id", "is_state"],
         )
 
+        hashes = self._get_prev_event_hashes_txn(txn, event_id)
+
         results = []
         for d in res:
-            hashes = self._get_event_reference_hashes_txn(
-                txn,
-                d["prev_event_id"]
-            )
+            edge_hash = self._get_event_reference_hashes_txn(txn, d["prev_event_id"])
+            edge_hash.update(hashes.get(d["prev_event_id"], {}))
             prev_hashes = {
-                k: encode_base64(v) for k, v in hashes.items()
+                k: encode_base64(v)
+                for k, v in edge_hash.items()
                 if k == "sha256"
             }
             results.append((d["prev_event_id"], prev_hashes, d["is_state"]))