Missing keyframes when combining multiple animations

[mohitsinghs]

What version of Tailwind CSS are you using?

2.2.0

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

None

What version of Node.js are you using?

None

What browser are you using?

Firefox

What operating system are you using?

Ubuntu 20.04

Reproduction repository

https://play.tailwindcss.com/clI0hhAxuo

Describe your issue

When combining multiple animations ( for example animation-1, animation-2-after-delay ) while extending animations and keyframes, the keyframes related to combined animations are missing from the build.

To see this bug in action, run this with both available versions of tailwindcss on play.tailwindcss.com. The older version correctly includes all keyframes and both logo and bullets are animated but when switching to v2.2.0, logo has no animation since keyframes related to those animations are not included.