This appears to be a bug in NSObject.KeyValueObservingPublisher. It's triggered because the values property only sends an initial Demand of .max(1) when it subscribes to the KVO publisher. Forcing a larger Demand works around the problem. We can use the handleEvents operator to send unlimited demand to the KVO publisher: Task { for await value in obj .publisher(for: \.count) .handleEvents(receiveSubscription: { $0.request(.unlimited) }) .values { print("async: \(value)") } }

Use Group, with no more than 10 direct children in each Group. https://developer.apple.com/forums/thread/740677

Using Reality Composer Pro, you can make a custom material that feeds the left and right images into a GeometrySwitchCameraIndexNode.

This appears to be fixed in Xcode 14.0 beta 2. I had to clean my build folder for it to start working though.