Errot with Default Blend = Cut

Hello.
I hava a problem with Cinemachine version 2.6.0 and 2.6.0 preview.8. Unity 2019.2.19f1.
When I set Default Blend to "Cut", I see errors:

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. UnityEngine.Rendering.PostProcessing.PostProcessLayer.ResetHistory () (at Library/PackageCache/com.unity.postprocessing@2.1.6/PostProcessing/Runtime/PostProcessLayer.cs:726)
3. Cinemachine.PostFX.CinemachinePostProcessing.OnCameraCut (Cinemachine.CinemachineBrain brain) (at Library/PackageCache/com.unity.cinemachine@2.6.0-preview.8/Runtime/PostProcessing/CinemachinePostProcessing.cs:185)
4. UnityEngine.Events.InvokableCall`1[T1].Invoke (T1 args0) (at C:/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent.cs:207)
5. UnityEngine.Events.UnityEvent`1[T0].Invoke (T0 arg0) (at C:/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent/UnityEvent_1.cs:58)
6. Cinemachine.CinemachineBrain.ProcessActiveCamera (System.Single deltaTime) (at Library/PackageCache/com.unity.cinemachine@2.6.0-preview.8/Runtime/Behaviours/CinemachineBrain.cs:587)
7. Cinemachine.CinemachineBrain.ManualUpdate () (at Library/PackageCache/com.unity.cinemachine@2.6.0-preview.8/Runtime/Behaviours/CinemachineBrain.cs:355)
8. Cinemachine.CinemachineBrain.LateUpdate () (at Library/PackageCache/com.unity.cinemachine@2.6.0-preview.8/Runtime/Behaviours/CinemachineBrain.cs:312)

Everything is ok when Default Blend is not set to "Cut". How I can solve this problem?

Thanks