transformIndexHtml errors with "No matching HTML proxy module found" when referencing entry point as import

[ricardo-devis-agullo]

Describe the bug

Scaffold any SSR example from create-vite-extra and to the following changes:

Wrap the code of the client entry point in

// client-entry.js
export default function render() {
  // previous code...
}

Change the script src to manually import the function

<!-- <script type="module" src="src/client-entry.js"></script> -->
<script type="module">
import render from "./src/client-entry.js"

render();
</script>

This will fail with: "No matching HTML proxy module found from /?html-proxy&index=0.js"

There is a similar issue on #5061, but it's considered closed, so I'm not sure if this particular case is different, not supported or a bug, since the same changes work on non ssr normal examples.

Reproduction

https://stackblitz.com/edit/stackblitz-starters-7m9qws?file=index.html

Steps to reproduce

Run npm install followed by npm run dev

System Info

System:
    OS: macOS 14.6.1
    CPU: (12) arm64 Apple M2 Max
    Memory: 691.38 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.8.0 - ~/.volta/tools/image/node/22.8.0/bin/node
    npm: 10.8.2 - ~/.volta/tools/image/node/22.8.0/bin/npm
    pnpm: 8.15.5 - ~/Library/pnpm/pnpm
    bun: 1.1.3 - ~/.bun/bin/bun
  Browsers:
    Chrome: 129.0.6668.60
    Edge: 129.0.2792.65
    Safari: 17.6

Used Package Manager

npm

Logs

No response

Validations

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• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
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• The provided reproduction is a minimal reproducible example of the bug.

[stackblitz]

Start a new pull request in StackBlitz Codeflow.

• stackblitz-starters-7m9qws (Open reproduction)