We introduces Storyboards to be default in new projects. That causes an issue when using the property Ti.App.forceSplashAsSnapshot = true which makes sure to show the launch screen as soon as the user puts the app in background to ensure sensible information like bank accounts and password are not visible during multitasking.
The issue is, that the (legacy) splashscreen-image is shown, not the storyboard. In addition, we should not even package splash screens anymore, if we use storyboards. That issue is tracked here.