MapStateToProps未触发问题排查求助

我知道类似的问题已经被问过好多次了，但我翻遍了各种资料还是没解决。情况是这样的：当触发AUTHENTICATION_LOGOUT这个action时，我能追踪到reducer确实返回了新的状态对象，但组件里的connect就是没捕获到状态变化，导致mapStateToProps根本不执行。我明明返回了新的状态对象，按道理Redux应该能识别出这是状态变更而不是修改原状态，对吧？会不会是Redux或者相关依赖的bug，或者版本不兼容的问题？麻烦大家帮忙看看，谢谢了！

相关代码片段 #

auth_actions.js #

export const appLogout = () => async dispatch => { 
  await AsyncStorage.removeItem(USER); 
  dispatch({ type: "AUTHENTICATION_LOGOUT" }); 
};

auth_reducer.js #

export default function (state = {}, action) { 
  switch (action.type) { 
    case "AUTHENTICATION_SUCCESS": 
      return { user: action.payload }; 
    case "AUTHENTICATION_LOGOUT": 
      return {user: null }; 
    default: 
      return state; 
  } 
}

reducers/index.js #

export default combineReducers({ search, auth });

AuthComponent.js #

import React, { Component } from 'react'; 
import { Text, TouchableOpacity, View } from 'react-native'; 
import { connect } from 'react-redux'; 

class AuthScreen extends Component { 
  ... 
} 

function mapStateToProps(state) { 
  let { auth } = state; 
  return { user: auth.user }; 
} 

export default connect(mapStateToProps, actions)(AuthScreen);

Store配置代码 #

const store = createStore( 
  reducers, 
  {}, 
  compose( 
    applyMiddleware(thunk) 
  ) 
); 

export default store;

App.js #

import store from './store'; 
import { Provider } from 'react-redux'; 

export default class App extends React.Component { 
  render() { 
    return ( 
      <Provider store={store}> 
        <MainNavigation /> 
      </Provider> 
    ); 
  } 
}

package.json依赖 #

"dependencies": { 
  "axios": "^0.18.0", 
  "expo": "^27.0.0", 
  "react": "16.3.1", 
  "react-native": "https://github.com/expo/react-native/archive/sdk-27.0.0.tar.gz", 
  "react-redux": "^5.0.7", 
  "redux": "^3.7.2", 
  "redux-thunk": "^2.2.0" 
}

问题解决更新 #

经过一番死磕排查，我终于找到问题根源了：这个AuthScreen组件在触发logout的时候已经被卸载了，所以它自然接收不到任何状态更新。我通过在组件里加componentWillUnmount钩子验证了这一点——触发logout时这个钩子确实执行了。之前一直纠结状态修改的方式，完全是被相关讨论带偏了。感谢所有给我提供思路的朋友！

内容的提问来源于stack exchange，提问作者BlackLog