Be strict about putting changes in mutations.

src/main.js

@@ -38,7 +38,8 @@ const store = new Vuex.Store({
     api: apiModule,
     config: configModule
   },
-  plugins: [createPersistedState(persistedStateOptions)]
+  plugins: [createPersistedState(persistedStateOptions)],
+  strict: process.env.NODE_ENV !== 'production'
 })
 
 const routes = [

src/modules/users.js

@@ -33,6 +33,9 @@ export const mutations = {
   },
   addNewUsers (state, users) {
     each(users, (user) => mergeOrAdd(state.users, user))
+  },
+  setUserForStatus (state, status) {
+    status.user = find(state.users, status.user)
   }
 }
 
@@ -54,11 +57,11 @@ const users = {
 
       // Reconnect users to statuses
       each(statuses, (status) => {
-        status.user = find(store.state.users, status.user)
+        store.commit('setUserForStatus', status)
       })
       // Reconnect users to retweets
       each(compact(map(statuses, 'retweeted_status')), (status) => {
-        status.user = find(store.state.users, status.user)
+        store.commit('setUserForStatus', status)
       })
     },
     loginUser (store, userCredentials) {