Bug in iPhone 12 Pro

I think there is bug, I have iPhone 12 pro, when you perform below action iPhone get half screen and nothing works properly. #BugiPhone 12 pro#

1. When iPhone is locked, rotate phone and keep the phone locked only.

2. Then use upper top right corner open calculator (you have to add calculator in shortcut)

3. Then moment you launch the calculator app, screen shows half display of the calculator, and nothing actually works.

Please see below: