Inconsistent / missing registration & last IP

Is there a section in your discourse.conf that tells it to set_real_ip with your IPv6 address, something like this?

    - replace:
        filename: /etc/nginx/conf.d/discourse.conf
        from: "types {"
        to: |
          set_real_ip_from 192.168.1.0/24;
          set_real_ip_from 172.18.0.0/24;
          set_real_ip_from 172.17.0.0/24;
          set_real_ip_from <SOME_IP_V6_ADDRESS_THING_HERE?>
          real_ip_recursive on;
          real_ip_header X-Forwarded-For;
          types {
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