OVR Skeleton Type reset after load or when pressing play

Every time I load my project in Unity or press play in the Unity editor, the OVRHandPrefab for the left and right Anchor get the Skeleton Type reset to None (from Hand left/right) in the OVR Skeleton section in the inspector. Seems like some enum or json parsing of the values in the project file is not working and therefor the setting is reset.

Anyone experienced this and found a solution? The hands are working (e.g. I can pinch to go to the Meta menu, but they are just not rendered.

Best regards

  Hans...