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Just to let you know: I do have the exact same problem with Xcode 12 beta 5. @pi80223 Same here. Got the same issue on Xcode 12 beta 5. Overriding the .environment(\.widgetFamily, .systemSmall) triggers the same error Setting the WidgetFamily value to .systemSmall in .previewContext(WidgetPreviewContext(family:)) only resizes the preview context, but the widget view is still rendering for the .systemMedium family

In Making Data Available to the App Clip’s Corresponding App - https://developer.apple.com/documentation/app_clips/making_data_available_to_the_app_clip_s_corresponding_app#3599728, there is a caveat saying: In addition, you can’t make information the app clip stores in the keychain accessible to its corresponding full app. Does that mean, even if we add the app clip to same app group with its full app, the app clip's keychain items can't be shared to the full app via Keychain Access Groups - https://developer.apple.com/documentation/security/keychain_services/keychain_items/sharing_access_to_keychain_items_among_a_collection_of_apps#2974918?