Terminal and Console show different values for vuex data

Describe the issue / bug.

# I have a modal component that emits a store action on submit with a specific payload. The modal is used to create new items in a list or edit existing ones. Payload includes a property payload.myItem.id which is an empty string for new items. The action calls a mutation which is supposed to assign a new ID and push a new object to a store array if payload.myItem.id is empty or update an existing object if it's not empty. If you take a look at the console.logs() and the output in the console, you'll see that payload.myItem.id which was empty before the mutation, has an ID in the console.log('start mutation', payload.myItem.id) before the command to assign a new ID. The weird thing is that the terminal logs don't match the console and show correct values. How is that possible? And how do I make Vue use the correct value? Here are some code snippets:

// Modal component save function
    handleModalSave() {
      let payload = {
        layerId: this.layer.id,
        myItem: {
          id: this.editLayerForm.id,
          text: this.editLayerForm.text
        }
      }
      console.log('save', payload.myItem.id)
      this.$store.dispatch('saveLayerItem', payload)
    }

// Store action
  saveLayerItem: ({ commit }, payload) => {
    console.log('action payload', payload)
    commit('SAVE_LAYER_ITEM', payload)
  }

// Store mutation
  SAVE_LAYER_ITEM: (state, payload) => {
    console.log('mutation start', payload.myItem.id)
    let layer = state.map.layers.find(layer => layer.id === payload.layerId)
    if (payload.myItem.id !== '') {
      // For existing items
      let itemIdx = layer.items.findIndex(item => item.id === payload.myItem.id)
      Vue.set(layer.items, itemIdx, payload.myItem)
    } else {
      // For new items
      payload.myItem.id = guid()
      layer.items.push(payload.myItem)
    }
    console.log('mutation end', payload.myItem.id)
  }

If visual, provide a screenshot.

# Here are two screenshots of 1) the console logs and 2) the corresponding terminal logs:

Tell me about your development environment.

Node version: v10.16.3
NPM version: 6.11.3
vue-cli version: (if necessary)
Operating System: MacOS 10.14.6

SimulatedGREG / electron-vue