Nested atrule in unused selector results in broken CSS output

[Rich-Harris]

Describe the bug

This...

<style>
  .unused {
    @media (min-width: 400px) {
      color: red;
    }
  }
</style>

...results in this:

  /* (unused) .unused*/ {
    @media (min-width: 400px) {
      color: red;
    }
  }

Reproduction

link

Logs

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System Info

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Severity

annoyance