Hand Tracking Meshes stay in position once tracking lost

Added OVRHandPrefab as per Oculus docs. I have set Controllers + Hands, as I want my user to use Hands in some parts of the application, and Controller in others.

However if I just move my hand quickly out the way, the mesh stays put in the last position until I show it again or until I pickup a controller.

I'd expect the hand to disappear, like the in Quest menu.

Quest 2

Unity 2013.3.10

Oculus Integrations 46.0