Dual mode is broken

[EsmailELBoBDev2]

Description

Whenever I try to use dual mode it does not let me select servers from dropmenu. it only see its local self but not the remote server I added

Server

Every info you can provide about your server: web server, database, PHP version, ... as well as server-side speedtest settings
If possible, provide an URL to your speedtest so we can check it

Client

Brave, Arch Linux

Steps to reproduce

• Follow https://github.com/librespeed/speedtest/blob/master/doc_docker.md
• when using mode: dual it does not show all servers in servers.json file

Expected behaviour

in dual mode it sees itself and other server and let me select between servers

Screenshots

with dual mode

without dual mode, I run 2 images now one with mode frontend and other with backend locally

configs

servers.json:

[
    {
        "name": "Server 1",
        "server": "//public-ip:port/",
        "dlURL": "garbage.php",
        "ulURL": "empty.php",
        "pingURL": "empty.php",
        "getIpURL": "getIP.php"
    },
    { 
        "name": "Server 2",
        "server": "//public-ip:port/",
        "dlURL": "garbage.php",
        "ulURL": "empty.php",
        "pingURL": "empty.php",
        "getIpURL": "getIP.php"
    }
]

docker compose (main server)

  librespeed:
    container_name: librespeed
    image: ghcr.io/librespeed/speedtest:latest
    restart: always
    volumes:
      - ./librespeed/servers.json:/servers.json
    environment:
      MODE: dual
      #CORS_ALLOW_ORIGIN: "*"
      #TITLE: "LibreSpeed"
      #TELEMETRY: "false"
      #ENABLE_ID_OBFUSCATION: "false"
      #REDACT_IP_ADDRESSES: "false"
      #PASSWORD:
      #EMAIL:
      #DISABLE_IPINFO: "false"
      #IPINFO_APIKEY: "your api key"
      #DISTANCE: "km"
      #WEBPORT: 80
    ports:
      - "8020:80" # webport mapping (host:container)

the second server

  librespeed:
    container_name: librespeed
    image: ghcr.io/librespeed/speedtest:latest
    restart: always
    volumes:
      - ./librespeed/servers.json:/servers.json
    environment:
      MODE: backend
      #MODE: frontend
      #TITLE: "LibreSpeed"
      #TELEMETRY: "false"
      #ENABLE_ID_OBFUSCATION: "false"
      #REDACT_IP_ADDRESSES: "false"
      #PASSWORD:
      #EMAIL:
      #DISABLE_IPINFO: "false"
      #IPINFO_APIKEY: "your api key"
      #DISTANCE: "km"
      #WEBPORT: 80
    ports:
      - "8020:80" # webport mapping (host:container)

but when I use both images one for frontend and other for backend it works fine on main server and I can see both servers

[EsmailELBoBDev2]

and now I cant access it via https https://speedtest.esmailelbob.xyz/ it says No servers available but locally it works great so not sure what I really did wrong and if its bug or issue on my end