How to reproduce:
1. Open a new Unity project
2. Build and deploy on iOS
3. Observe the Unity splash screen

Expected result: the Unity splash screen proceeds without the iOS status bar visible
Actual result: the status bar briefly shows up at the top of the splash screen

Reproducible with: 2018.4.23f1, 2019.3.16f1, 2020.1.0b12, 2020.2.0a14

Reproduces on:
VLNQA00160 iPhone 6S iOS 13.3.1

Does not reproduce on:
VLNQA00183 iPad mini iOS 9.3.5

Notes:
1. In some versions (2018.4, 2019.2), the status bar only shows up on initial launch; trying to open the app over and over may not help produce the bug.
2. Possible workaround:

// in: SplashScreen.mm
// in: void ShowSplashScreen(UIWindow* window) implementation
// after: _controller = [storyboard instantiateInitialViewController];
// add:
/*
UIView* storyboardView = _controller.view;
_controller.view = nil;
_controller = [[SplashScreenController alloc] init];
_controller.view = storyboardView;
_controller->_supportedOrientations = { true, true, true, true }; // quickly hardcoded but should change according to the supported orientations
*/
// Note: _supportedOrientations must be set as @public