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This PR fixes an issue where if you only used `@reference` that we didn't process Tailwind CSS features. We have a 'quick bail check', in the PostCSS plugin to quickly bail if we _konw_ that we don't need to handle any Tailwind CSS features. This is useful in Next.js applications where every single CSS file will be passed to the PostCSS plugin. If you use custom font ins Next.js, each of those fonts will have a CSS file as well. Before we introduced `@reference`, we used `@import "tailwindcss" reference`, which passed the bail check because `@import` was being used. Now we have `@reference` which wasn't included in the list. This is now solved. Fixes: #16056 ### Test plan Added a failing test that is now failing after the fix.