Unity Depth API - EnvironmentDepthFrameDesc.createTime is always 0

I need the createTime to work around a problem which seems to occur because my project doesn't use OVRCameraRig.

I am using the sample code from https://github.com/oculus-samples/Unity-DepthAPI (and the packages they embed) with a simple script to dump the params.

I have tried upgrading the Meta SDK to 65 but it is the same.