Detecting if object is Umbra culled

I am trying to figure out a way to check if an object is being culled by umbra.

For the gameplay scenario, I need to know when an object is no longer being seen, even if it is still in the camera frustum. Once the object is no longer seen, I know the player wont observe any changes to it.

However, if the object stays in front of the player, even if it is behind a solid wall, the object is still considered visible, and the renderer enabled, even though using the scene view culling visualization, I can tell that it is not being actually drawn.

As far as I know, the only way to do this would be raycasting yourself to determine if the view is blocked.