Reuse components with internal state an vuex module store

Question

I want to reuse a Counter component with his own internal store.

The problem is when I change the state, it´s changed in all the Counter instances. I´m returning state as state = () => ({}) but, It´s shared in all instances...

How can setup this to use his own state? Demo: https://codesandbox.io/s/infallible-black-k9e8f