What version of Tailwind CSS are you using?
"postcss": "^8.5.3",
"tailwindcss": "^4.0.9"
"@tailwindcss/postcss": "4.0.0-alpha.13",
"autoprefixer": "^10.4.20",

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

"next": "^15.2.1",
"turbo": "^2.4.4",

What version of Node.js are you using?

For example: v18.19.0

What browser are you using?

firefox

What operating system are you using?

macOS

Reproduction URL
https://github.com/VulcanTech-io/tailwindcss-postcss-plugin-issue
Describe your issue

const config = {
  plugins: {
    "@tailwindcss/postcss": {},
  },
};
export default config;

Adding this plugin breaks support for global imports from node modules when there is a font being imported from them.
for minimal reproduction "fix" comment out the plugin. But then tailwindcss is no longer working.

⨯ ./node_modules/@milkdown/crepe/lib/theme/common/style.css
Error evaluating Node.js code
CssSyntaxError: postcss-import: ~/turbo-test/node_modules/@milkdown/crepe/lib/theme/common/prosemirror.css:1:1: Failed to find '@milkdown/kit/prose/view/style/prosemirror.css'