Cloudflare SaaS fallback with customer cname domain 522

I have
  • setup a worker with a custom domain pointing to customers.x.dev
  • set the fallback as customers.x.dev on the /ssl-tls/custom-hostnames page and is active
  • have set y.dev to as a custom hostname on /ssl-tls/custom-hostnames and is verified and active
  • have set a CNAME on y.dev to customers.x.dev (tried proxied and non-proxied)
When i access customers.x.dev it does respond correctly, however when accessing y.dev I get Connection timed out Error code 522

Account id: 6e810700260d9b58e259560786fb1e92
can dm the sites in question 😄

I have used CF SaaS before using worker custom domains and got it to work with the worker route wildcard, so is there a way to also use the fallback with worker custom domains?
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