[Gear VR Controller] 'Back key' not working at Unity 2017.2

I'm using Unity 2017.2 and Oculus SDK 1.19.0.

For checking the status of Back key of My Gear VR Controller, I wrote the below simple code.

bool isBackPressed = OVRInput.GetDown(OVRInput.Button.Back);

When I tested...

• Unity 2017.1 & Oculus SDK 1.18.0 : No problem.
• Unity 2017.2 & Oculus SDK 1.18.0 : Back key is not work.
• Unity 2017.2 & Oculus SDK 1.19.0 : Back key is not work.

I think that there is some problem when Unity update to OpenXR..

So.. I tried the below code.

bool isBackPressed = OVRInput.GetDown(OVRInput.Button.Back) || OVRInput.GetDown(OVRInput.Button.Two);

It's works... But sometimes it does not work.

I think that Oculus developers should check the Input System if they update to Unity 2017.2.