title: ToolbarItem is showing a spot instead of image?
body: <p>I'm creating an app using Xamarin and I am trying to add a <code>ToolbarItem</code> with icon, on Android it works fine but on iOS it just show a white spot as can see in the image below and I don't know why it is happening.</p>
  
  <p>How could I fix this ? </p>
  
  <p><strong>ToolbarItem</strong></p>
  
  <pre><code>&lt;ContentPage.ToolbarItems&gt;
          &lt;ToolbarItem Icon="icon.png"  /&gt;
      &lt;/ContentPage.ToolbarItems&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/rmvVz.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rmvVz.jpg" alt="enter image description here"></a></p>