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Thanks for the response Claude.The actual view in the UIBarButtonItem was not rendered correctly. I have changed the UI stack and constraints. Its working now.

I have added a Left Bar Button Item to a UIViewController Navigation Bar. The Bar Button Item has a UIView as subview which has button. The UIButton is assigned a selector using code. It a combination of Storyboard and a single line of code for assigning the action to the button.Whats intiguing is that it works fine when compiled with XCode 10.3. It has been working fine for few years now. It also works fine when compiled by XCode 11 and deployed on iOS 13. The issue only occurs when i install on iOS 12.4 from XCode 11. Thanks for the response.