Vue3/Vuex - Component not reflecting state change when using destructuring assignment

I am using Vue 3 with Vuex. I am unable to get Vue to react to a change in state when mutating the state via destructuring assignment. Though, I am able to get Vue to react when I change state via a mutation that only reassigns a single value.

Am I doing something incorrectly?

The following code works

I have a component that pulls in a Vuex getter in setup():

const someValue = computed(() => store.getters['app/getSomeValue'])

The code below dispatches the action that mutates this value and will react just fine:

store.dispatch('app/setSomeValue', newValue)

The mutation:

setSomeValue(state, value) {
  state.someValue = value
},

The following code does not work

What if I wanted to alter multiple properties of a module's state without having to rely on multiple mutations? I'd use object destructuring. The following code, when logged, shows that a state change does happen, but neither the component that uses it nor Vuex devtools reflects a change.

1. The action being dispatched:

store.dispatch('app/setSomeValue', { someValue: newValue })

2. The mutation using destructuring:

setState(state, payload) {
 state = { ...state, ...payload }
}

Now, I shouldn't even have to change the getter. Though using this method, Vue doesn't pick up on a change. If I log state after I use destructuring, it shows someValue as being updated. What gives?

Reassigning the entire state object must be breaking reactivity or otherwise causing Vuex to lose track of state changes somehow.

Use Object.assign to copy the key-values from your payload to your store's state while maintaining the same original state object in memory.

setState(state, payload) {
  Object.assign(state, payload)
}