You're not crazy! We still don't do v6 UDP (there's no good reason for us not to, but it'll be a week of rebuilding a BPF engine while the plane's still in the air, so this task never hits the top of our stack and won't until someone really pressures us on it). Full honesty! That's how we roll on HN. :)
I'm a big fan of Fly and have one medium-sized app deployed to it. Just waiting on this specific issue before deploying more: https://community.fly.io/t/allow-non-root-users-to-write-to-...