FB11647680 - includes a sample project where titlebar should not be visible yet is on Ventura betas. Thanks anonymous frameworks engineer ;-)

This should also work and require way less code changes than the above: NSAnimationContext.runAnimationGroup { animationContext in context.duration = animated ? 0.5 : 0 clipView.animator().setBoundsOrigin(p) } completionHandler: { Task { await MainActor.run { self.endIgnoreFrameChangeEvents() } } }