Hand Tracking V2 Stopped Working

I am using the Oculus Integration SDK for unity (version 38.0), and a couple of months ago I added this line to my manifest file:

<meta-data android:name="com.oculus.handtracking.version" android:value="V2.0"/> 

which is supposed to enable the improvement of the tracking. 

The tracing was actually improved for some time and now turned back to function the same as it functioned with the older version of the Hand Tracking (V1). dose someone faced this odd problem before?