Durable object websocket close not working

export class Manager extends DurableObject {

    async fetch(request: Request) {
        // Creates two ends of a WebSocket connection.
        const webSocketPair = new WebSocketPair();
        const [client, server] = Object.values(webSocketPair);

        // Calling `acceptWebSocket()` informs the runtime that this WebSocket is to begin terminating
        // request within the Durable Object. It has the effect of "accepting" the connection,
        // and allowing the WebSocket to send and receive messages.
        // Unlike `ws.accept()`, `state.acceptWebSocket(ws)` informs the Workers Runtime that the WebSocket
        // is "hibernatable", so the runtime does not need to pin this Durable Object to memory while
        // the connection is open. During periods of inactivity, the Durable Object can be evicted
        // from memory, but the WebSocket connection will remain open. If at some later point the
        // WebSocket receives a message, the runtime will recreate the Durable Object
        // (run the `constructor`) and deliver the message to the appropriate handler.
        this.ctx.acceptWebSocket(server);

        this.ctx.waitUntil((async () => {
            const websockets = this.ctx.getWebSockets();
            for (const ws of websockets) {
                if (ws === server) {
                    ws.send('Hello from the Durable Object!');
                    ws.close(1008, 'Connection closed');
                }
            }
        })());

        console.log('Handler finished');

        return new Response(null, {
            status: 101,
            webSocket: client,
        });
    }

    async processRequest(request: Request) {

    }

}