CSS from entrypoints is not extracted correctly

Describe the bug

I am using vite with JavaScript entry point.

If I have entry points with styles (e.g. Vue components) and also async styles (e.g. async Vue component),
and I set build.cssCodeSplit: false then vite will not correctly extract the CSS.

For the async import the styles are loaded using module preload correctly.
But for the entry points with static imports no CSS entry point is created, so I do not know which CSS file I need to add to my application.

Expected behavior:

• Either duplicate the styles in entry-point-name.css for the styles synchronously used by that entry point
• Or create a entry-point-name.css with @import for the css chunks used synchronously by that entry point

Reproduction

https://stackblitz.com/edit/vitejs-vite-bagjfe?file=vite.config.js

Steps to reproduce

1. Run npm ci && npx vite build
2. See that there is neither a main.css nor a second.css but just some "randomly" named assets¹

¹ For bigger projects this might contain a lot of css assets with random names.

System Info

Does not matter, but:

  System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    vite: ^5.3.1 => 5.3.1

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.

Start with the linked StackBlitz reproduction and vite.config.js, then run npm ci && npx vite build and inspect the generated CSS assets. The fix should make CSS entry files such as main.css or second.css available for styles synchronously used by each entry point when cssCodeSplit is false.