Can't fire through wire fences with main gun ,Cargo Port

I hope this is in the right place.

I have found that playing Cargo Port at 4 BR I cant fire through wire fences with my main gun.I used to be able to knock them down with an MG but cannot even fire through them with a 75mm. This is new and its a game killer.Has to be a bug right? Cargo port is the only game map they have not screwed up. Wheter to fire through the fences or not is a big tactical choice and this bug screws the game up from that side of the map.