Safe area with iPhone Duo in Split View

Hi.

When using the brand new iPhone Duo simulator I found a weird thing. When my app is running on the left side in a split view, the tab bar is appearing on the left side. But when I print the safe area of the window, it showed

▿ UIEdgeInsets
  - top : 0.0
  - left : 0.0
  - bottom : 34.0
  - right : 0.0

But isn't the left inset supposed to be 469-385 = 84?

When it's running on the right side, the safe area insets seems to be correct:

▿ UIEdgeInsets
  - top : 0.0
  - left : 0.0
  - bottom : 34.0
  - right : 84.0

Here's how I get the safe area insets. Please correct me if I'm using a wrong way.

extension UIApplication {
    var currentScene: UIWindowScene? {
        return connectedScenes.first as? UIWindowScene
    }
}

extension UIApplication {
    var currentKeyWindow: UIWindow? {
        currentScene?.windows.filter { $0.isKeyWindow }.first
    }
}

// Somewhere in my code
static var safeAreaInsets: UIEdgeInsets {
    let window = UIApplication.shared.currentKeyWindow
    let insets = window?.safeAreaInsets ?? .zero
    return insets
}

Thank you guys so much for reading.