In Odoo 17, I used the bus_service to listen for custom notifications and fetch user information. However, after upgrading to Odoo 18 (which uses OWL), my existing logic for listening to the "notification" event does not work as expected.
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patch(ProductsWidget.prototype, {

    setup() {

        super.setup(...arguments);

        onMounted(this.onMounted);

    },

    onMounted() {

        var self = this;

        const notification = ({ detail: notifications }) => {

            self.fetchUserName(notifications);

        };

        self.env.services["bus_service"].addEventListener("notification", notification);

    },

    fetchUserName(notifications) {

        console.log("notifications==>", notifications)

    },

});

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def fetchUserName(self):

    for user in self:

        invite_partner = user.create_uid.partner_id

        if invite_partner:

            self.env['bus.bus']._sendone(invite_partner, 'res.users/connection', {

                'username': user.name,

                'partnerId': user.partner_id.id,

            })