On a Cloudflare Pages site on a custom

On a Cloudflare Pages site (on a custom domain), I'm making an API request to a Worker (on a custom domain) via fetch(), with cache everything and cachettl set. The response object has some Cloudflare headers on it - cf-priority, cf-ray, server - but no CF-Cache-Status. I was expecting to see that to verify if the request was cached or not.

What have I missed, please?
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