Since [1], the notifications of type `simple_notification` are handled by a service in the bus module. Before [2] those notifications were handled by the messaging handler which was only loaded in the backend. This commit restores the previous behavior as the simple notification service starts the bus service which result in the websocket worker being loaded why it should be done lazily (i.e. only when the livechat is used). [1]: https://github.com/odoo/odoo/pull/119243 [2]: https://github.com/odoo/odoo/pull/110188 closes odoo/odoo#122266 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>