Fix Verify step

lib/ui/public/app/store.js

@@ -3,6 +3,7 @@ import fieldData from './fieldData';
 import v4Fields from './v4fields';
 import axios from 'axios';
 import { get } from 'lodash';
+import { toRaw } from 'vue';
 
 const initStore = (config, ui) => createStore({
   state: {
@@ -132,8 +133,10 @@ const initStore = (config, ui) => createStore({
           await context.dispatch('createFilter', filterConfig);
         }
         context.state.filters.forEach(filter => {
-          flow.steps.push(filter);
-        });      
+          // the flow gets passed back to the app via a window.postMessage call, which clones objects passed in the message.
+          // As of Vuex 4, state items are Proxy objects, which cannot be cloned, so we have to use `toRaw()`.
+          flow.steps.push(toRaw(filter));
+        });
       }
       context.state.ui.create({ flow });
     }