Launch Screen storyboard migration issue

问题

I have an app built in Objective C which uses Launch Screen Image Set as a splash screen. According to recent Apple's new Guidelines

Apps for iPhone or iPad must be built with the iOS 13 SDK or later and use an Xcode storyboard to provide the app’s launch screen. Reference - https://developer.apple.com/news/?id=03262020b

I removed the Launch image and added a LaunchScreen.storyboard with an UIImageView. After making the mentioned change all my screens following the Launch screen appear to have scaled-down in dimensions whereas before adding the LaunchScreen.storyboard it worked fine for all iPad screen sizes.

This is how the screen following the launch screen looks when the Launch Image Set is used

This is how the screen following the launch screen looks when LaunchScreen.storybpard is used[.

I am confused as to why migrating from Launch screen image to LaunchScreen.storyboard is affecting the constraints of all the remaining screens. Please could someone help me here?

PS: Both screenshots are of iPad Pro 12.9 inch

来源：https://stackoverflow.com/questions/62511339/launch-screen-storyboard-migration-issue