multiple animation scoping broken

[danielchabr]

Version

13.3.0

Reproduction link

https://codesandbox.io/s/38qjmqom46

Steps to reproduce

Use animation style with multiple keyframes referenced while adding space after a comma:
h1 {
animation: color 5s infinite, opacity 5s;
}
If the space after comma is removed, everything works.

What is expected?

All animations keyframe references should be scoped

What is actually happening?

Only the first one will be scoped

---

I have created pull request with fix and added new assertions to tests to test this scenario #1030