Exercise already solved for animation-play-state track?

When attempting to solve https://exercises.upcase.com/exercises/animation-play-state, I noticed that the original version already implemented the solution to the exercise.

The problem states “Make the ball stop swinging when hovering over it.”

and if you download the repo and try it you’ll see that the ball stops swinging on hover without any modifications.

Am I missing something?

Ahhh - I figured it out after reviewing other solutions. Very subtle.