Animations don't work with prefix

[marcorieser]

What version of Tailwind CSS are you using?

v4.0.9

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

Vite 6.1.0

What version of Node.js are you using?

v20.18.3

What browser are you using?

Chrome

What operating system are you using?

macOS

Reproduction URL
Not working (with prefix): https://play.tailwindcss.com/qTUjgxKQEu
Working (without prefix): https://play.tailwindcss.com/n1FLqahYjR

Describe your issue

Prebuilt animations like animate-spin (https://tailwindcss.com/docs/animation) and custom animations don't work when a prefix is used.

[philipp-spiess]

Oh, thanks for the repro! Seems like the @keyframes is not emitted here, we'll look into it.

[philipp-spiess]

Will be fixed in the next patch release, thank you!