Upgrade to latest ionic4 version, tabs navigation not work

Bug Report

Ionic version: [x] 4.x Current behavior:

After I upgrade ionic4 latest version, there is a routing issuse: when I have more than one page using tabs, and navigate from one tab to another, then clicking on the tab buttons changes the url but does not change the displayed page, always the default page is displayed . When I click browser refresh button with the changed url, the correct page will be displayed, but clicking tab still as the previous.

Expected behavior:

Should display the page;

Steps to reproduce:

Related code:

const routes: Routes = [
  {
    path: 'tabs',
    component: TabsPage,
    children: [
      {
        path: 'goods',
        children: [{
          path: '',
          loadChildren: '@pages/goods/goods.module#GoodsPageModule'
        }]
      },
      {
        path: 'order',
        children: [{
          path: '',
          loadChildren: '@pages/order/order.module#OrderPageModule'
        }]
      },
      {
        path: 'mine',
        children: [{
          path: '',
          loadChildren: '@pages/mine/mine.module#MinePageModule'
        }]
      },
      {
        path: '',
        redirectTo: '/tabs/mine',
        pathMatch: 'full'
      }
    ]
  },
  {
    path: '',
    redirectTo: '/tabs/goods',
    pathMatch: 'full'
  }
];

Ionic info:

Ionic:
   ionic (Ionic CLI)             : 4.12.0 (/usr/local/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.1.1
   @angular-devkit/build-angular : 0.13.5
   @angular-devkit/schematics    : 7.2.4
   @angular/cli                  : 7.3.5
   @ionic/angular-toolkit        : 1.4.0
Cordova:
   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
   Cordova Platforms     : android 7.1.4, ios 4.5.5
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.2, cordova-plugin-ionic-webview 2.0.3, (and 10 other plugins)
System:
   Android SDK Tools : 26.1.1 (/Users/cundongzhang/Library/Android/sdk)
   ios-deploy        : 1.9.4
   NodeJS            : v8.12.0 (/usr/local/bin/node)
   npm               : 6.4.1
   OS                : macOS Mojave
   Xcode             : Xcode 10.1 Build version 10B61

[zcd0000]

I found this caused by my global.scss file content, I lost two lines: core.css and display.css in this file. Previous version maybe don’t need these files. After I add them, Tab navigation then works correctly.

@import "~@ionic/angular/css/core.css";
@import "~@ionic/angular/css/display.css";

[ionitron-bot[bot]]

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