I was playing competitive mode on the attacker side. I was able to see and shoot through the door in the yellow tunnel at the first primary objective, without having to destroy the secondary objective to open it. The defending team was not able to see me.
Underground Secondary Objective Glitch
Remedica
(Remedica)
#2
There’s one post about this already: http://forums.dirtybomb.nexon.net/discussion/17446/underground-side-objective-doors-bug#latest