Scoped nested css does not emit properly after vite build

[ycmjason]

Here is the minimal reproduction of the issue.

https://github.com/ycmjason/vite-issue-reproduction-scoped-nested-css

I've included the dist in the repo.

This is the css emitted (formatted):

.fine[data-v-b9dfe1ae] {
  color: green;
}
.fine[data-v-b9dfe1ae]__not {
  color: red;
}

The scope id is placed incorrectly as shown above.

Thanks for the amazing tool. Vite made development much less painful.

[ycmjason]

Please note that the correct CSS is emitted in dev mode.