You can solve this issue by setting the BackgroundColor of your AppShell to Transparent. After that, SafeAreaEdges="None" on your pages works correctly, and your content can extend into the safe area.

Example:

<Shell
    x:Class="YourApp.AppShell"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    Shell.FlyoutBehavior="Disabled"
    Shell.BackgroundColor="Transparent">

    <TabBar>
        <!-- Your ShellContent -->
    </TabBar>
</Shell>