diff --git a/synapse/handlers/sliding_sync/__init__.py b/synapse/handlers/sliding_sync/__init__.py
index 32ece82079..295d3486c4 100644
--- a/synapse/handlers/sliding_sync/__init__.py
+++ b/synapse/handlers/sliding_sync/__init__.py
@@ -303,7 +303,7 @@ class SlidingSyncHandler:
                 to_token=to_token,
                 newly_joined=room_id in interested_rooms.newly_joined_rooms,
                 is_dm=room_id in interested_rooms.dm_room_ids,
-                receipts=receipts,
+                room_receipts=receipts[room_id] if room_id in receipts else None,
             )
 
             # Filter out empty room results during incremental sync
@@ -575,7 +575,7 @@ class SlidingSyncHandler:
         to_token: StreamToken,
         newly_joined: bool,
         is_dm: bool,
-        receipts: Sequence[ReceiptInRoom],
+        room_receipts: Sequence[ReceiptInRoom],
     ) -> SlidingSyncResult.RoomResult:
         """
         Fetch room data for the sync response.
@@ -1370,7 +1370,7 @@ class SlidingSyncHandler:
             joined_count=joined_count,
             invited_count=invited_count,
             notif_counts=unread_notifs,
-            room_receipts=receipts[room_id] if room_id in receipts else None,
+            room_receipts=room_receipts,
         )
 
     @trace
diff --git a/synapse/handlers/sliding_sync/room_lists.py b/synapse/handlers/sliding_sync/room_lists.py
index d83f84109f..b465e4ab44 100644
--- a/synapse/handlers/sliding_sync/room_lists.py
+++ b/synapse/handlers/sliding_sync/room_lists.py
@@ -104,10 +104,6 @@ class SlidingSyncInterestedRooms:
         lists: A mapping from list name to the list result for the response
         relevant_room_map: A map from rooms that match the sync request to
             their room sync config.
-        relevant_rooms_to_send_map: Subset of `relevant_room_map` that
-            includes the rooms that *may* have relevant updates. Rooms not
-            in this map will definitely not have room updates (though
-            extensions may have updates in these rooms).
         newly_joined_rooms: The set of rooms that were joined in the token range
             and the user is still joined to at the end of this range.
         newly_left_rooms: The set of rooms that we left in the token range
@@ -129,7 +125,6 @@ class SlidingSyncInterestedRooms:
         return SlidingSyncInterestedRooms(
             lists={},
             relevant_room_map={},
-            relevant_rooms_to_send_map={},
             all_rooms=set(),
             room_membership_for_user_map={},
             newly_joined_rooms=set(),