React/Vite/Caddy re-routing is failing

Hi all, I've copy/pasted Brodie's nixpacks.tom & caddyfile to my react/vite project, and yesterday it was working fine. Overnight, the re-routing not-found domains has stopped working. I have a custom domain set up, and it works if I go straight to that domain on desktop (but not mobile?): bandbudgie.com Redirects to sign-in page (bandbudgie.com/sign-in) (as it should) If I refresh this on bandbudgie.com/sign-in I get a "This site can't be reached" error... The custom domain settings are set up on my DNS, and railway seems to think they are connected up properly... What's frustrating is that this was working okay last night, until I started messing around with some SMTP properties on the DNS end (though I left the railway CNAME record alone). Am I missing something? Was I not supposed to remove the Generated URL? A separate (but maybe related?) issue - my vite environment variables don't seem to be updating when I update my variables - that is, my RAILWAY_PUBLIC_DOMAIN updates within the Railway variables screen... but the value of import.meta.env.VITE_BASE_URL that is rendering in React isn't updating... Is this something to do with nixpack caching? ProjectId: 1e4b0651-0174-42a1-aac8-4081f16bb807