The isFullScreen attribute of UIWindowScene requires iOS 16+ on the dev doc.
However, this attribute requires iOS 13+ in the Xcode iOS SDK (I'm using Xcode 15.0.0)
This would lead to an issue that you can write something like:
if #available(iOS 13, *) {
windowScene.isFullScreen
}
and can pass the compilation, but crash on device using iOS 13~15.