If you hide an item that’s inside a visibility volume, leave the volume, then re-enter, the item you hid will be visible again.
Additionally, that item will not have any collision, but the collision prompt when right clicking will still say ‘Disable Collision’. To restore the item’s collision, you have to manually unhide the item in the IO debug menu (the collision toggle will not work).
Notes / Media
Video demonstration:
Item without collision: