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Would you provide a reproduction? I was able to run fetch in chrome 63 without passing method to it without any issues.

Also, Chrome 63 was released in 2017 - seven years ago. That's a bit long to be supporting this in Nuxt core, so I think it might make more sense for you to use patch-package or pnpm patch to update this line if you really need it.

I am do something with low chrome, But I think nuxt3 is a very nice framework.So, I do something to use nuxt3 in low browser, But I find doubtful questions.
when i fetchManifest, i will return 400 Bad Request. I debugger it then find use window fetch to request with method undefined.
if update patch-package will causing chain problem. I don't how many lib use it. And I think fetch manifest method only be 'get', it will not causing any problem.

// it will return 400 Bad request
fetch('/test', { method: undefined })

// it will return 200 Ok
fetch('/test', {})

step in any nuxt3 project

pnpm run build 
node .output/server/index.mjs

this is now resolved upstream in ofetch 🎉

thanks