The entire page is a grid. I’m trying to position a child grid on top of the parent grid. This works on Android. On Apple up to iPhone 14 too. On iPhones 14 and 15, the space between the parent and child grids is displayed.

enter image description here

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:mct="clr-namespace:CommunityToolkit.Maui.Behaviors;assembly=CommunityToolkit.Maui"
             x:Class="IOSMauiAppGroupsOneApp.NewPage1"
             Shell.BackgroundColor="{AppThemeBinding Light=#3856A8, Dark=#232234}"
             Shell.NavBarIsVisible="False"
             Title="NewPage1">
    <ContentPage.Behaviors>
        <mct:StatusBarBehavior StatusBarColor="{AppThemeBinding Light=#3856A8, Dark=#232234}" />
    </ContentPage.Behaviors>
    <Grid BackgroundColor="Red">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid Margin="0"
              Grid.Row="0"
              ColumnSpacing="16"
              Padding="16,12,16,12"
              HorizontalOptions="Fill"
              VerticalOptions="Start"
              BackgroundColor="{AppThemeBinding Light=#3856A8, Dark=#232234}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Button
                 Grid.Column="0"
                 Text="Сохранить"
                 BorderColor="White"
                 BackgroundColor="Transparent"
                 CornerRadius="8"
                 TextColor="White"/>
            <Image
                Grid.Column="3"
                Source="icon_folder.png"
                HorizontalOptions="EndAndExpand"
                VerticalOptions="Center"
                ToolTipProperties.Text="Открыть документ">
            </Image>
            <Image
                Grid.Column="2"
                HorizontalOptions="EndAndExpand">
            </Image>
        </Grid>
    </Grid>
</ContentPage>

Expectation: The child grid will be aligned to the top edge of the parent grid.