title: ionic 4 + angular: routerLink only works first time
body: <p>I'm having a weird bug while developing a basic app from scratch right now.
  I use Ionic 4 beta 19 and I've put a routerLink to another page, the route is set up in the base pages module like so:</p>
  
  <pre><code>RouterModule.forChild([
    { path: '', component: NewsPage },
    { path: ':id', component: DetailPage }
  ])
  </code></pre>
  
  <p>the routerLink attribute is set on a card and it works just fine when clicking on a card, but when I go back and press that same card or another one, the router just doesn't do anything at all. I don't get any errors and the URL in the browser is working perfectly. How can this be?</p>
  
  <p>Edit: Also, DetailPage doesn't have a module so it's basically just a page.</p>
  
  <p>Edit: Card code looks like this:</p>
  
  <pre><code>&lt;ion-card *ngFor="let item of items;" [routerLink]="[item.id]"&gt;
    ...
  &lt;/ion-card&gt;
  </code></pre>
  
  <p>In the detail page, route params are subscribed and the :id param will be used for a GET request subscription to retrieve the data</p>