How to animate the movement of a pseudo-element around a button with border-radius?

Question

css

I've been sitting all day, I can't make the animation of the icon around the button...
If you do it the usual way through translate, it turns out not smooth on the rounded edges. And the hack with rotate cannot be tied together with horizontal movement ... Help someone, I've been sitting for 5 hours already (
like this https://gyazo.com/63ec01198bebcb800cb566149356f61f