我尝试创建一个标题图像。net maui安卓应用程序，但标题是不可见的。即使我改变了标签，同样的结果：

<ContentPage  xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="ChapsPizza.Views.MainPage"
         xmlns:vm="clr-namespace:ChapsPizza.ViewModels"
         Title="Test">

<NavigationPage.TitleView>
    <Label Text="Test" TextColor="Black"/>
    <!--<Image Source="logo.png" Background="Orange"
        VerticalOptions="CenterAndExpand" 
        HorizontalOptions="CenterAndExpand"
        HeightRequest="40" WidthRequest="40"/>-->
</NavigationPage.TitleView>

<ContentPage.BindingContext>
    <vm:MainPageViewModel/>
</ContentPage.BindingContext>

https://imgur.com/a/AitiWWf
我该怎么补救呢？