Well... actually I think the items will show up in the maps, but will cause crashes when picked up. At least that's what it was like when I started working on the maps in the first place and why I had to delete loads of grenade panels from OIV that were lying around in the WF maps. Those items caused crashes and had to be deleted. I think having LBE items show up in an OIV game will basically work the same (=> CTD when picked up).