Utilities layer in theme

Using Themes
1

I am trying to use a tailwind library within my own theme. If I build the css from the root of the project it works fine, but when buried beneath themes/[theme-name] it comes up short by ~1200 lines.
I have used both postcss and tailwind cli successfully at project root and unsuccessfully theme deep.

{ 
  "dependencies": {
    "@tailwindcss/cli": "^4.1.6",
    "@tailwindcss/postcss": "^4.1.7",
    "@tailwindcss/typography": "^0.5.16",
    "postcss-cli": "^11.0.1",
    "tailwindcss": "^4.1.7"
  }
}