Navigation.PushAsync not working as expected in .NET Maui - maui

Question

I've got an app that I am porting over to Maui from XF. I have a toolbaritem in my navigationbar. Here is the basic definition:
<ContentPage.ToolbarItems>
<ToolbarItem Text="New Game" Clicked="NewGame_Clicked" x:Name="NewGame" />
</ContentPage.ToolbarItems>
<VerticalStackLayout><ListView........./></VerticalStackLayout>
Here is my NewGame_Clicked Event:
private void NewGame_Clicked(object sender, EventArgs e)
{
Navigation.PushAsync(new EventSetupPage());
}
Here is the content of the EventSetupPage() overly simplified:
<?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"
x:Class="ScanAndScoringMauiApp.Pages.EventSetupPage"
Title="EventSetupPage">
<VerticalStackLayout>
<Label
Text="Welcome to .NET MAUI!"
VerticalOptions="Center"
HorizontalOptions="Center" />
</VerticalStackLayout>
</ContentPage>
When the EventSetupPage() comes up, it is blank in an android 12 emulator. The constructor is called, so I know that something is happening. It's like the page is being loaded in the wrong thread. I'm doing something wrong. Any thoughts on what I should do to get my page to load? TIA
********** update 1 ************
As an fyi, I am loading the parent page via a messagecenter message. I do this in my xamarin forms app.
MessagingCenter.Subscribe<string>(this, "UpdateMainPage", (sender) =>
{
MainThread.BeginInvokeOnMainThread(() =>
{
MainPage = new NavigationPage(new GameList());
});
});