Caddyfile not updating after configuration change

I set up a VPS on Linode running NixOS using this guide a few years ago: https://www.linode.com/docs/guides/install-nixos-on-linode I have caddy set up to serve up a few different websites and applications and it’s been working great. Recently I went to set up gotosocial and a static site, so I updated the virtualHosts under services.caddy and issued sudo nixos-rebuild switch, which finished without errors. However, after this, the file at /etc/caddy/caddy_config was not updated with my change...