Issue with Trench Periscope in Singleplayer

Hi all

I've just started the Fog of War mission where you escort the tank through the forest. I've noticed a bug where the binoculars you have seem to drop when you pick a weapon up out of a crate. Doesn't seem to happen if you pick a weapon off a dead body. The binoculars float in the air for a few seconds. You can pick them back up, but when you switch to a weapon they just drop and float in the air again.

I couldn't find any fixes for this and it seems only a few other people have had the same issue. Anyone know a solution as this is kinda frustrating unless I stick to a pistol the whole level