- Fix user failing to deactivate with MAS when `/_synapse/mas` is handled by a worker. ([\#18716](https://github.com/element-hq/synapse/issues/18716)) - Fix performance regression introduced in [#18238](https://github.com/element-hq/synapse/issues/18238) by adding a cache to `is_server_admin`. ([\#18747](https://github.com/element-hq/synapse/issues/18747))