@tailwindcss/vite plugin not processing pseudo classes

[mgd216]

What version of Tailwind CSS are you using?

tailwindcss: "4.1.10",
"@nuxtjs/tailwindcss": "^7.0.0-beta.0",
`"@tailwindcss/vite": "^4.1.4"

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

`"@tailwindcss/postcss": "^4.1.11"

What version of Node.js are you using?

v23.7.0

What browser are you using?

Chrome

What operating system are you using?

Red Hat Linux 9 (RHEL9)

Reproduction URL

Stackblitz
Originally reported to Nuxt #32575

Describe your issue

Environment

• We are creating a Nuxt mono repo (using pnpm and Turbo Repo) for a client that will have a 'base layer' with shared TailwindCSS and Daisy UI components.
• We have configured the base layer to use @nuxtjs/tailwindcss to configure Tailwind.

Reproduction

• A minimal example can be found in this Stackblitz
• Note, Stackblitz defaults to pnpm but I ran into errors trying to get turborepo running with pnpm
• To setup, cd packages/myUi > npm install > npm run dev
• Open a second terminal window, cd apps/myApp > npm install > npm run dev

Describe the bug

• On the left you will see the Base Layer with a Dialog that says "Hello". This shows that Tailwind / Daisy are configured and running correctly in the base layer
• On the right you will see the App with a card, button, and alert to show that Tailwind / Daisy are configured from the Base Layer and running correctly.
• ERROR: The Issue is the dialog in the App Layer, notice in the base layer, the Hello DIalog has a 'backdrop' and the dialog is centered. However in the App layer, there is no backdrop and the dialog div is actually just unstyled in the upper left corner.
• We are using the Daisy Ui 'dialog method'
• The Chrome dev tools are showing a 'psuedo css' variable ::backdrop being append directly to the dialog.

• Not sure where this error is occurring, is it Nuxt, PostCss, NuxtJS/Tailwind module?

[thecrypticace]

Our Vite plugin is reasonably simple aside from some stylesheet and JS module loading hooks so I don't think it's an issue there but I'm not sure. Something definitely is weird about whatever is happening. I did notice there are multiple copies of Tailwind's styles (like preflight) in multiple style tags coming from different files but I don't know if that's part of the problem or not.

Will have to look into this further.