We are having same issue, iOS 26.1 final class ShareExtensionVC: UIViewController { ... override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = .clear self.modalPresentationStyle = .fullScreen } Presentation sheet is white. If I use a different color such as self.view.backgroundColor = .red I see a red sheet, but for a clear background I see a white sheet. In iOS 18.5 (last tested device) the clear background works fine.

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Same issue, I'm on Beta 6 now.