Navigation bar again button random background behaviour in iOS 26

Navigation bar again button generally has a white background on its liquid glass layer after I navigate to the display.

I would like it to be of clear background as proven beneath.

I’m not setting any tint or background on left bar button merchandise. Under is the code for navigation bar look.

let look = UINavigationBarAppearance()
    look.configureWithOpaqueBackground()
    look.backgroundColor = backgroundColor
    look.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: titleTextColor]
    look.titleTextAttributes = [NSAttributedString.Key.foregroundColor: titleTextColor]
    self.navigationController?.navigationBar.standardAppearance = look
    self.navigationController?.navigationBar.scrollEdgeAppearance = self.navigationController?.navigationBar.standardAppearance
    self.navigationController?.navigationBar.prefersLargeTitles = prefersLargeTitles