Horizontal stacklayout with label bug on windows phone

Good evening.

Using markup very similar to that in the xamarin forms tutorial I am unable to get the behaviour I want on windows phone.. I guess this is a bug because the iphone does behave as expected.

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:a="clr-namespace:TestProject;assembly=TestProject"
                       x:Class="TestProject.Main">
  <StackLayout Orientation="Horizontal" VerticalOptions="Start">

    <Image Source="https://xamarin.com/content/images/pages/forms/crm-app.png" WidthRequest="100" HeightRequest="100" />

    <StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand">
        <Label Text="Tthis is a test to see whether the text wraps correctly when it gets to the end on both IOS and Windows phone" />
    </StackLayout>

  </StackLayout>
</ContentPage>

On Windows Phone, the width of the label is greater than the remaining space available in the stacklayout, whereas on the iphone it wraps correctly. I have attached 2 screenshots to show this (take a look at where the text wraps on the windows phone image)