Xamarin.Forms CollectionView GridItemsLayout same height elements - ios

Question

How do I make the CollectionView render all items with the same height while using a GridItemsLayout on iOS? It already works on Android that all elements in a row gets the same height but on iOS they are squished vertically in the center of the row.
This is how it currently looks on iOS (how it not should be..):
And this is how it currently looks on Android (how it also should be on iOS - all elements are scaled to the same height in the same row):
As of now, this is how my XAML looks like:
<CollectionView Grid.Row="1" x:Name="DataListView" ItemSizingStrategy="MeasureAllItems" ItemsSource="{Binding Data}" IsGrouped="False" ItemTemplate="{StaticResource EntryTemplate}"
Header="{Binding Header}" Footer="{Binding Footer}" BackgroundColor="{DynamicResource DarkBackgroundColor}">
<CollectionView.ItemsLayout>
<!-- Span is set in OnSizeAllocated to make this "dynamic" -->
<GridItemsLayout x:Name="GridItemsLayout" Orientation="Vertical" Span="1" />
</CollectionView.ItemsLayout>
<CollectionView.HeaderTemplate>
<DataTemplate x:DataType="x:String">
<Grid Padding="10,20">
<Label Text="{Binding}" TextColor="{DynamicResource TextColor}" FontAttributes="Bold" HorizontalTextAlignment="Center" LineBreakMode="WordWrap" />
</Grid>
</DataTemplate>
</CollectionView.HeaderTemplate>
<CollectionView.FooterTemplate>
<DataTemplate x:DataType="x:String">
<Grid Padding="{OnPlatform iOS=20 30 20 20, Default=20}">
<Label Text="{Binding}" TextColor="{DynamicResource LightTextColor}" FontSize="Micro" HorizontalTextAlignment="Center" LineBreakMode="WordWrap" />
</Grid>
</DataTemplate>
</CollectionView.FooterTemplate>
</CollectionView>
This is my entry data template XAML:
<DataTemplate x:Key="EntryTemplate" x:DataType="data:Entry">
<Grid BackgroundColor="Red" VerticalOptions="FillAndExpand" Margin="0">
<Frame WidthRequest="{Binding Converter={StaticResource FlowColumnWidthConverter}, ConverterParameter=324}" BackgroundColor="{DynamicResource DarkerBackgroundColor}"
BorderColor="{Binding IsActive, Converter={StaticResource ActiveToColorConverter}}" HorizontalOptions="Center" Margin="8" Padding="10" CornerRadius="5">
<Frame.GestureRecognizers>
<TapGestureRecognizer Tapped="OnChecklistElementTapped" />
</Frame.GestureRecognizers>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Image Grid.Row="0" Grid.Column="0" Grid.RowSpan="4" Source="{Binding Type, Converter={StaticResource TypeToEmbeddedImageConverter}}" WidthRequest="32" HeightRequest="32" Margin="4" />
<Label Grid.Row="0" Grid.Column="1" Text="{Binding Name}" FontAttributes="Bold" LineBreakMode="TailTruncation" VerticalOptions="Start" />
<Label Grid.Row="1" Grid.Column="1" Text="{Binding Region}" FontSize="12" LineBreakMode="TailTruncation" VerticalOptions="Start" Margin="0,-6,0,0" />
<Label Grid.Row="2" Grid.Column="1" Text="{Binding AdditionalData}" TextType="Html" FontSize="12" LineBreakMode="WordWrap" Margin="0"
IsVisible="{Binding AdditionalData, Converter={StaticResource EmptyToVisibilityConverter}}" InputTransparent="True" />
<Label Grid.Row="3" Grid.Column="1" Text="{Binding Description}" FontSize="12" LineBreakMode="WordWrap"
IsVisible="{Binding Description, Converter={StaticResource EmptyToVisibilityConverter}}" />
<Switch Grid.Row="0" Grid.Column="2" Grid.RowSpan="2" IsToggled="{Binding IsDone}" HorizontalOptions="Center" VerticalOptions="Center" />
<StackLayout Grid.Row="2" Grid.Column="2" Grid.RowSpan="2" Orientation="Horizontal" Spacing="12" HorizontalOptions="Center" VerticalOptions="Start" Margin="0,4,0,4">
<controls:TintedImageButton Source="Details.png" Clicked="OnNavigateToDetailsButtonClicked" HeightRequest="32" WidthRequest="32"
IsVisible="{Binding Details, Converter={StaticResource EmptyToVisibilityConverter}}"
HorizontalOptions="Center" BackgroundColor="Transparent" />
<controls:TintedImageButton Source="Map.png" Clicked="OnNavigateToMapButtonClicked" HeightRequest="32" WidthRequest="32"
HorizontalOptions="Center" BackgroundColor="Transparent" IsVisible="{x:Static resources:Metadata.MAP_ENABLED}" />
</StackLayout>
</Grid>
</Frame>
</Grid>
</DataTemplate>
And this is my code behind (where I set how many columns there should be):
protected override void OnSizeAllocated(double width, double height)
{
base.OnSizeAllocated(width, height);
GridItemsLayout.Span = Convert.ToInt32(Math.Floor(width / 340d));
}
Anyone has an idea, why this is looks different on iOS in the first place and what I should look up to fix this problem?