[Bug] In the WPF project with a SplashScreen, the first MessageBox.Show in the App's OnStartup method always fails #10067
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Description
In the WPF project with a SplashScreen, the first MessageBox.Show in the App's OnStartup method always fails (the display disappears for 0.3 seconds or so and returns No, which does not block the thread).
No matter how long it sleeps before that, It always fails the first time.
debugging log:
Reproduction Steps
New WPF Project with .NET 8.0 Using OnStartup in App.xaml
Expected behavior
The first messagebox should block the threads
Actual behavior
In the WPF project with a SplashScreen, the first MessageBox.Show in the App's OnStartup method always fails (the display disappears for 0.3 seconds or so and returns No, which does not block the thread). This does not convey interactive information
Regression?
.NET CORE3.1 does not have a SplashScreen.
Known Workarounds
No response
Impact
No response
Configuration
No response
Other information
No response
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