Alias not working with IPX

Alias is not working with default provider IPX

Reproduction:
https://stackblitz.com/edit/github-kmj5sa?file=nuxt.config.ts

I did a npm run generate i.e. nuxi generate.
The image generated still contains the domain.

Below is the settings:

  image: {
    domains: ['images.pexels.com'],
    alias: {
      backend: 'https://images.pexels.com',
    },
  },

and image generated

https://githubkmj5sa-smd0--3000--1f9496ab.local-credentialless.webcontainer.io/_ipx/f_webp/https://images.pexels.com/photos/38292/walnut-nut-fruit-bowl-healthy-38292.jpeg

I thought maybe alias just doesn't work with IPX but in the IPX provider code I see
https://github.com/nuxt/image/blob/58c5139106ed1552a98d318b5ca281e298c36180/src/runtime/providers/ipx.ts#L38
which makes me think IPX does support alias.

Start with the StackBlitz reproduction and nuxt.config.ts, run npm run generate (nuxi generate), then inspect src/runtime/providers/ipx.ts at the linked provider logic. Confirm how the alias setting is handled for IPX and ensure the generated image URL uses the configured alias rather than the original domain.