I am seeing a reproducible App Switcher rendering artifact with ManagedSettingsUI shield customization. When a Screen Time shield is customized with ShieldConfiguration.backgroundColor, the shield appears with an uncropped rectangular background layer in the iOS App Switcher. Square corners become visible around the shield card/background layer. This disappears when backgroundColor is nil, and reappears as soon as any UIColor is provided. I also observed the same behavior in another Screen Time app that customizes its shield background, so this does not appear to be specific to my app. Minimal repro: Create an iOS app using FamilyControls, ManagedSettings, and ManagedSettingsUI. Add a ShieldConfigurationDataSource extension. Return a ShieldConfiguration with backgroundColor set to any UIColor. Shield an app and open the shielded app. Open the iOS App Switcher. Example: return ShieldConfiguration( backgroundBlurStyle: .regular, backgroundColor: UIColor(red: 246/255, green: 238/255, blue: 227/255, alpha: 1) ) Expected: The shield background should be clipped consistently with the App Switcher card/screen corner mask. Actual: The shield background appears as a full rectangular layer in the App Switcher, exposing square corners. Control tests: backgroundColor = nil: no square-corner artifact. backgroundColor = UIColor(...): square-corner artifact appears. The issue occurs regardless of backgroundBlurStyle, including nil, .regular, and .systemUltraThinMaterialLight. I filed this through Feedback Assistant as well. Has anyone found a workaround that still allows a custom shield background color?