Animations not working with prefix

[KevinHurts]

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?

Next.js 15.1.7

What version of Node.js are you using?

Node.js v22.14.0

What browser are you using?

All browsers

What operating system are you using?

macOS

Reproduction URL

https://play.tailwindcss.com/R0p05ajupq
I have added 2 buttons with both the animate-pulse class on it. One with prefix and one without.
When removing the prefix the animation works.

Describe your issue

Once a prefix is set the animations do not work anymore.
I have noticed that once a prefix is added the className and the variables are correct but the needed keyframes for the animation are missing which is probably the cause of the animation not working.

[KevinHurts]

I can confirm that everything works once you add the keyframes manually.

[wongjn]

This should be fixed by #16850. I'd anticipate that the fix will be released in the next version.