I am using Socket.io with react to do a chat room, when a new user join the room i want to send an update to all clients.

const updateDiscussionClients = room => {
    let currentClients = RoomClients({room, io, connections})
    console.log(currentClients); // printing correct data
    console.log(io.sockets.adapter.rooms.get(room));
    socket.to(room).emit('clients_discussion', currentClients)
}

socket.on("join_discussion", (data) => {
    let room = 'room_' + data.id + data.name
    socket.join(room)
    updateDiscussionClients(room)
   
})

everything is working fine but the message received by old client, without the last one who

output of the logs:

[
  { name: 'Mohamad Zbib', id: '202100006' },
  { name: 'pu10', id: '10' }
]
Set(2) { 'pbKuaEdrfg7n83YyAAAD', '3QYOJCzlxxMOLquzAAAB' }

the event is received by pbKuaEdrfg7n83YyAAAD, but 3QYOJCzlxxMOLquzAAAB didn't receive it , he will receive if an update happened later