WhistleFactory whistleWindow not removed after display?

[JCsplash]

Is there a reason why the whistleWindow is not removed after displaying? It's causing issues in my code whenever I call UIApplication.shared.windows.first, which returns the whistleWindow and not the expected keyWindow.

I forked the project and made whistleWindow an optional and I set it to nil when the display has finished.

public func hide() {
    let finalOrigin = view.frame.origin.y - titleLabelHeight - Dimensions.notchHeight
    UIView.animate(withDuration: 0.2, animations: {
      self.whistleWindow?.frame.origin.y = finalOrigin
      }, completion: { _ in
        if let window = self.previousKeyWindow {
          window.isHidden = false
          self.whistleWindow = nil // Setting this to nil... Will this cause any problems?
          self.previousKeyWindow = nil
          window.rootViewController?.setNeedsStatusBarAppearanceUpdate()
        }
    })
  }

Will this solution cause any problems?