Redis Adapter emits message twice

[willjk]

When I use callbacks and I follow this pattern client-1 -> server -> client-2 -> callback-to-server -> callback-to-client-1 the adapter appears to send messages twice to client-2. Here is replication code. When I comment out all redis things it will only send once

Server

`const socketIo = require("socket.io");
const redisAdapter = require("@socket.io/redis-adapter");
const redis = require("redis");

const io = new socketIo.Server(
{
cors: {
origin: process.env.ORIGIN,
methods: ["GET", "POST"],
credentials: true,
},
}
);

let ns = io.of('/');

const pubClient = redis.createClient({ url: "redisurl" });
const subClient = pubClient.duplicate();

Promise.all([pubClient.connect(), subClient.connect()]).then(() => {
io.adapter(redisAdapter.createAdapter(pubClient, subClient));
io.listen(PORT);
});

pubClient.on('connect', () => {
console.log('::> Redis Client Connected');
});
pubClient.on('error', (err) => {
console.log('<:: Redis Client Error', err);
});

ns.on("connection", async (socket) => {
socket.on("host:broadcast", async (data, callback) => {
const room = socket.to(data.room);
room.emit("member:message", data, (arg) => {
callback(arg);
});
});
});

`