How to fix bug with ion-back-button?

Ionic Framework
1

I have implemented an ion-back-button into my toolbar in order to navigate back. But the button is not at its proper place and somehow displaced.
I even directly copied the code from the documentation but it still doesn’t work.

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Bildschirmfoto 2019-01-25 um 23.56.26.png1286×158 2.81 KB 

<ion-header>
    <ion-toolbar>
      <ion-buttons slot="start">
        <ion-back-button></ion-back-button>
      </ion-buttons>
    </ion-toolbar>
  </ion-header>
2

Maybe it needs a title even if not set for the spacing on iOS?

<ion-header>
  <ion-toolbar>
    <ion-buttons slot="start">
      <ion-back-button></ion-back-button>
    </ion-buttons>

    <ion-title>Something or not</ion-title>
  </ion-toolbar>
</ion-header>