I managed to solve this issue. In my scenario it was caused by a race condition in reading the Keychain too early in the app launch. I was checking for an auth token on the keychain within SceneDelegate.scene(_:willConnectTo:options:). Instead I wait for the keychain protected data to become available like so:     func refreshAuthFromKeychain(_ callback: @escaping (Bool) -> Void) {         /// Avoid race condition where the app might try to access keychain data before the device has decrypted it         guard UIApplication.shared.isProtectedDataAvailable else {             NotificationCenter .default .publisher(for: UIApplication.protectedDataDidBecomeAvailableNotification) .first() .sink { _ in                 self.refreshAuthFromKeychain(callback)             }.store(in: &cancellables)             return         } .... /// Then load from the keychain

I think I am also experiencing this issue, although it is difficult to verify. I store an auth token on the keychain but have had the app seemingly delete it after a few hours. We are not experiencing this on iOS14.

Did you end up finding a way to do this @pprovins? I’m also trying to access per-node uniforms in a DRAW_SCENE pass with custom shaders. it’s simple enough to bind a global uniform with symbols, but I can’t find any details on how to do it per node.