Requests getting cancelled/not reaching worker

I have three workers setup for the same domain, all with sub-domains setup. See here:

The first two are routing correctly: api.runestone.io and cdn.runestone.io (both returning 404 at the moment, by design). But GET dashboard.runestone.io gets cancelled so it never hits the worker:

I don’t think there’s anything wrong with the DNS settings:

The dev URL for the worker does work so I don’t believe this is a worker error: https://runestone-dashboard.andrewdjessop.workers.dev/

How can I debug this?

Crazy thing here is that if I rename it to dash.runestone.io it works. Maybe dashboard is a reserved word?

It shouldn’t be reserved, have you tried workers custom domains(beta)?