Volumes visible on screen cannot be selected with box selection if "Box Select Occluded Objects" is enabled

When using box selection with "Box Select Occluded Objects" enabled, volumes in the box selection zone are not able to be selected.

1. Add primitives (cube, sphere, cones etc.) to an empty level.
2. Add any kind of volume to the level (Postprocess volume, pain causing volume, lightmass importance volume etc.)
3. In editor settings, add a hotkey for enabling "Box Select Occluded Objects".
4. Back in the level, first use CTRL + ALT + Left Mouse to drag a selection box over all the added actors in the level, and note that volumes are able to be selected.
5. Press the hotkey assigned to enable selecting occluded objects, then drag to box select again and now note that volumes can no longer be selected.