Recently Synapse dropped unused (by Synapse itself) table "room_names" which brakes room name retrieval for ma1sd. There is a table "room_stats_state" from which we can retrieve room name by it's ID. Note that people to people conversations do not contain room names, because they are generated on-the-fly by setting other participants names separated by word "and". That's why this query will only get names for rooms where room names are set during creation process (or changed later) and are the same for all participants.
Link to Synapse code where it drops "room_names" table: https://github.com/matrix-org/synapse/blob/master/synapse/storage/data_stores/main/schema/delta/56/drop_unused_event_tables.sql#L17
NullIsNot0andGitHub