Base64 image is not displayed in the correct form

Question

I'm trying to display an base64 image. It has to work in two different scenarios, but the image is just shown once.

Ejs is working fine:

<img id="host-img" src="data:image/<%=justtalk.image.contentType%>;base64,<%=justtalk.image.data.toString('base64')%>">

                                                                

Iterating through a loop doesn't work:

<script>
    const socket = io('/start');

    socket.on("receiveRooms", (room, callback) => {
        for(var i = 0; i < room.length; i++) {
            setTimeout("", 3000);
            var data2 = '<img id="host-img" src="data:image/'+room[i].image.contentType+';base64,'+room[i].image.data.toString('base64')+'"> '

                $(data2).prependTo('#');
                
        }    
    })
</script>

I can't see the difference