What version of Tailwind CSS are you using?

v4.0.15 (latest)

What build tool (or framework if it abstracts the build tool) are you using?

Vite 6.2.2 (latest)

Reproduction URL

https://codesandbox.io/p/devbox/x3r86q

Describe your issue

Initial setup:

• Import Tailwind and another CSS file(s) into the root CSS file

Steps to reproduce:

1. Edit index.html (may be a change to JS/JSX files too)
2. Edit imported.css
3. Outdated CSS will be served until another change to index.html or index.css is made, or until the server is restarted. Page refresh doesn't serve the latest CSS either.

CSS changes work fine without @import "tailwindcss". It also works when using @tailwindcss/postcss instead of the Vite plugin.

Might be related
#16764