Broadcast->toOthers() not working with Laravel Echo and Fetch API?

Hello there,

I am currently trying to get Laravels' toOthers-Feature to work with my events. My events get fired correctly. Channel authorization works. Listening to events on the client-side also works. The only thing which is not working: Events are also received by the current user which is subscribed to the channel even if I use the toOthers-method.

I am using the fetch API on the client-side with Laravel Echo. This is how I instantiate Laravel Echo:

                this.echo = new Echo({
                    authorizer: (channel, options) => {
                        return {
                            authorize: (socketId, callback) => {
                                const request = $fetch(config.public.baseUrl + '/broadcasting/auth', {
                                    async onRequest({ request, options }) {
                                        options.method = 'post'
                                        options.body = {
                                            socket_id: socketId,
                                            channel_name: channel.name
                                        }
                                        options.headers = {
                                            'X-XSRF-TOKEN': token,
                                            'Accept': 'application/json',
                                            'X-Socket-ID': socketId,
                                        },
                                            options.credentials = 'include'
                                    },
                                })
                                request.then((response) => {
                                    console.log(response)
                                    callback(null, response)
                                })
                            }
                        };
                    },
                    broadcaster: 'pusher',
                    key: config.public.pusherAppKey,
                    cluster: 'mt1',
                    wsHost: config.public.pusherHost,
                    wsPort: config.public.pusherPort,
                    forceTLS: config.public.pusherTlsForce,
                    disableStats: true,
                    encrypted: true,
                    auth: {
                        headers: {
                            'X-XSRF-TOKEN': token,
                            'Accept': 'application/json',
                        },
                    },
                    enabledTransports: ['ws', 'wss'],
                });

As you see I also add the X-Socket-ID-Header like described in the docs. I fire my event with: broadcast(new MyEvent($myEventData))->toOthers();

The event is fired after my Backend receives a HTTP Call from an external Web Service.

But I still receive the event with the current logged in user if I listen to it like:

            this.echo.private(this.channelName)
                .listen('.my.event', (e) => {
                    console.log(e);
                })

Can anybody give me hint what is missing?