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-rw-r--r--synapse/handlers/presence.py6
-rw-r--r--synapse/handlers/room.py21
2 files changed, 25 insertions, 2 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 2670e561d7..0066d63987 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -256,7 +256,7 @@ class BasePresenceHandler(abc.ABC):
         with the app.
         """
 
-    async def update_external_syncs_row(
+    async def update_external_syncs_row(  # noqa: B027 (no-op by design)
         self, process_id: str, user_id: str, is_syncing: bool, sync_time_msec: int
     ) -> None:
         """Update the syncing users for an external process as a delta.
@@ -272,7 +272,9 @@ class BasePresenceHandler(abc.ABC):
             sync_time_msec: Time in ms when the user was last syncing
         """
 
-    async def update_external_syncs_clear(self, process_id: str) -> None:
+    async def update_external_syncs_clear(  # noqa: B027 (no-op by design)
+        self, process_id: str
+    ) -> None:
         """Marks all users that had been marked as syncing by a given process
         as offline.
 
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 984f4ad5af..7e6d6490aa 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -1077,6 +1077,19 @@ class RoomCreationHandler:
             for_batch: bool,
             **kwargs: Any,
         ) -> Tuple[EventBase, synapse.events.snapshot.EventContext]:
+            """
+            Creates an event and associated event context.
+            Args:
+                etype: the type of event to be created
+                content: content of the event
+                for_batch: whether the event is being created for batch persisting. If
+                bool for_batch is true, this will create an event using the prev_event_ids,
+                and will create an event context for the event using the parameters state_map
+                and current_state_group, thus these parameters must be provided in this
+                case if for_batch is True. The subsequently created event and context
+                are suitable for being batched up and bulk persisted to the database
+                with other similarly created events.
+            """
             nonlocal depth
             nonlocal prev_event
 
@@ -1141,6 +1154,14 @@ class RoomCreationHandler:
         )
         current_state_group = event_to_state_group[member_event_id]
 
+        # we need the state group of the membership event as it is the current state group
+        event_to_state = (
+            await self._storage_controllers.state.get_state_group_for_events(
+                [member_event_id]
+            )
+        )
+        current_state_group = event_to_state[member_event_id]
+
         events_to_send = []
         # We treat the power levels override specially as this needs to be one
         # of the first events that get sent into a room.