[v4] When using a `reference` theme, `--default` variables don't work

[Steffan153]

What version of Tailwind CSS are you using?

v4.0.0-alpha.8

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

Astro 4.5.2, Vite 5.1.6

What version of Node.js are you using?

Bun 1.0.30

What browser are you using?

Chrome

What operating system are you using?

macOS

Reproduction URL

Tailwind Play doesn't have v4 yet? But here's a link with the code (doesn't work) https://play.tailwindcss.com/NhYGudCbaL

Describe your issue

If I import the theme as a reference (@import 'tailwindcss/theme' reference;), many properties such as transition still look for --default variables:

.transition-all {
    transition-property: all;
    transition-timing-function: var(--default-transition-timing-function);
    transition-duration: var(--default-transition-duration);
}

But those variables aren't set, so it doesn't work.

[adamwathan]

Fixed in #13219, will be available in the next alpha later today 👍