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-rw-r--r--changelog.d/11220.bugfix1
-rw-r--r--synapse/app/generic_worker.py2
-rw-r--r--synapse/events/snapshot.py5
3 files changed, 8 insertions, 0 deletions
diff --git a/changelog.d/11220.bugfix b/changelog.d/11220.bugfix
new file mode 100644
index 0000000000..8baae28d5b
--- /dev/null
+++ b/changelog.d/11220.bugfix
@@ -0,0 +1 @@
+Fix using MSC2716 batch sending in combination with event persistence workers. Contributed by @tulir at Beeper.
diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py
index 502cc8e8d1..b4bed5bf40 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -113,6 +113,7 @@ from synapse.storage.databases.main.monthly_active_users import (
 )
 from synapse.storage.databases.main.presence import PresenceStore
 from synapse.storage.databases.main.room import RoomWorkerStore
+from synapse.storage.databases.main.room_batch import RoomBatchStore
 from synapse.storage.databases.main.search import SearchStore
 from synapse.storage.databases.main.session import SessionStore
 from synapse.storage.databases.main.stats import StatsStore
@@ -240,6 +241,7 @@ class GenericWorkerSlavedStore(
     SlavedEventStore,
     SlavedKeyStore,
     RoomWorkerStore,
+    RoomBatchStore,
     DirectoryStore,
     SlavedApplicationServiceStore,
     SlavedRegistrationStore,
diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py
index d7527008c4..f251402ed8 100644
--- a/synapse/events/snapshot.py
+++ b/synapse/events/snapshot.py
@@ -322,6 +322,11 @@ class _AsyncEventContextImpl(EventContext):
         attributes by loading from the database.
         """
         if self.state_group is None:
+            # No state group means the event is an outlier. Usually the state_ids dicts are also
+            # pre-set to empty dicts, but they get reset when the context is serialized, so set
+            # them to empty dicts again here.
+            self._current_state_ids = {}
+            self._prev_state_ids = {}
             return
 
         current_state_ids = await self._storage.state.get_state_ids_for_group(