I'm experiencing a similar issue on iOS 26. When rotating the device to landscape, view.safeAreaInsets.top incorrectly returns 20pt instead of 0pt. The value only updates correctly after backgrounding the app. This was working as expected prior to iOS 26.

This could help you get the correct keyboard height: let keyboardHeight = yourView.frame.height - yourView.keyboardLayoutGuide.layoutFrame.minY

A solution I found in my case, though not ideal given the app was built with keyboard notifications, is to use: UIKeyboardLayoutGuide - https://developer.apple.com/documentation/uikit/uikeyboardlayoutguide to adjust your views based on the appearance of the keyboard.