modules have same prop in state will be override when mergeProps in components

[dwqs]

I have a module and b module, both states have the same title prop:

//a module
export default {
    namespace: 'a',
    state: {
          title: 'a module'
    }
}

//b module
export default {
    namespace: 'b',
    state: {
          title: 'b module'
    }
}

when merging title prop to vue component:

// ...

export default {
       // ...
       computed: {
            ...mergeProps({
                  'titlea': 'a.title',
                  'titleb': 'b.title'
            })
       } 
      // ...
}

// ...

The titlea and titleb have the same value: a module or b module.
What's expected is that titlea is a module and titleb is b module.