Motion tracking not working with Front-facing camera

We are using Placenote. In our project, sometimes we need to enable front-facing camera. Currently we do it with ARFaceManager(from ARFoundation), but it’s noticed that when user moves, the motion tracking DOES NOT WORK at all. The motion trakcing works only 3DoF, not 6DoF!

Is that a known issue? Is there any suggestion for handling the front-facing camera with Placenote?

All right, I just learned from this document from Unity that only from ARKit3 / ARFoundation 4? support 6DoF tracking with front-facing camera, while Placenote is using ARKit 2. So the question here is when can we expect the upgrade to the new ARKit?