[w3c/ServiceWorker] cors image request retry not work (#1488)

I am investigating a usage scenario of ServiceWorker:
1. Our static resources are hosted on the CDN. We have two CDN domain names, `https://cdna.com` and `https: //cdnb/.com`, and both have set the `access-control-allow-origin` header to *
2. HTML loads an image on CDN `https://cdna.com`: `<img src = "https://cdna.com/img.png">`
3. Due to DNS pollution, `https://cdna.com/img.png` failed to load
4. Important: Can I switch the URL to https://cdnb.com/img.png and try again?

The ServiceWorker I run on chrome didn't give the resolved Response to the website, but the loading failed.

Could anyone tell me why this is, thanks in advance.

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https://github.com/w3c/ServiceWorker/issues/1488