The CUSTOM_LEMMY_SERVERS environment variable doesn't appear to work

When I connect to it, I always get lemmy.world as the default instance. Any ideas?

My docker-compose.yml:

<pre style="background-color:#ffffff;">
<span style="color:#323232;">services:
</span><span style="color:#323232;">  voyager:
</span><span style="color:#323232;">    image: ghcr.io/aeharding/voyager:latest
</span><span style="color:#323232;">    restart: always
</span><span style="color:#323232;">    volumes:
</span><span style="color:#323232;">      - "/etc/localtime:/etc/localtime:ro"
</span><span style="color:#323232;">    environment:
</span><span style="color:#323232;">      - CUSTOM_LEMMY_SERVERS=sh.itjust.works
</span><span style="color:#323232;">    labels:
</span><span style="color:#323232;">      - com.centurylinklabs.watchtower.enable=true
</span><span style="color:#323232;">      - autoheal=true
</span><span style="color:#323232;">    healthcheck:
</span><span style="color:#323232;">      test: ['CMD-SHELL', 'nc -z localhost 5314 || exit 1']
</span><span style="color:#323232;">      interval: 2s
</span><span style="color:#323232;">      timeout: 1s
</span><span style="color:#323232;">      retries: 10
</span><span style="color:#323232;">
</span>