Describe the bug

I packaged css as an entry file, and the expected asset name is not as expected, such as duplication caused by chunkName rewriting, plugins/css.ts. is not just css.

For details, see minimal example: vite-css-post-plugin-demo.

Related PR #9485

Reproduction

https://github.com/yzydeveloper/vite-css-post-plugin-demo

System Info

System:
    OS: Windows 10 10.0.19043
    CPU: (4) x64 Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz   
    Memory: 3.12 GB / 7.89 GB
  Binaries:
    Node: 16.9.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.11 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 7.22.0 - ~\AppData\Roaming\npm\npm.CMD
  Browsers:
    Chrome: 105.0.5195.102
    Edge: Spartan (44.19041.1266.0), Chromium (105.0.1343.33)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    @vitejs/plugin-legacy: ^2.0.0 => 2.0.0
    vite: ^3.0.0 => 3.0.4

Used Package Manager

pnpm

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.
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• The provided reproduction is a minimal reproducible example of the bug.