Pausing/resuming ARCoreSession with Unity Ads

I am currently using an implementation of ARCore based on the ARCore and UnityARInterface examples. To pause and resume the session, I will enable/disable the ARCoreSession component. This successfully resumes the experience with retained planes, scene interactions and camera use.

When presenting the user with an advert (via Unity Advertisements), I will pause the session, but upon returning it appears that the whole scene is reloaded, rather than simply resuming. This does not occur when played in-editor (using AREditorInterface). In the editor, adverts are replaced with Unity's "This screen will be your Ad Unit" debug screen, so I can't be certain that the same possible scene change is occurring.

Has anybody had experience with successfully pausing and resuming the ARCore session during adverts? This does not occur with a similar implementation with ARKit.

 

I'm having trouble with this too. Anyone know what's up?