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Cylinder target not found if the camera can see it when scene starts...

Hi not sure if this is a bug..

If I have a scene in Unity, with a cylinder target & that target is in view of the camera when I press Play in the editor, I get message "Trackable Cylinder Trim Lost" and no AR content.  If I move my cylindrical target out of the camera view  and back in, it works fine and I see the AR content.  If I start the scene with the target hidden and then move the target into view it works fine.

What can I do about this?

thnx.