ARPointCloudManager creates new ARPointCloud every time it is disabled/enabled

Hi there,

As it says in the title. We disable and re-enable both our ARSession and ARSessionOrigin to save battery when we're in full screen menus. However, the ARPointCloudManager adds a new ARPointCloud to its trackables collection every time we do. The last entry in the collection is always the 'right one' but its kind of an annoying thing to have to deal with if we just want to grab the ARPointCloud to check the points.

Is this a known issue? Maybe I just shouldn't be disabling ARSessionOrigin?