I've been straight up shot through mountains, buttes, pillars, prison walls etc. I think it's only by med lasers that I've noticed.
The very first time it was at the prison, and Decker went down because of it, CT cored out by a ML while hiding behind what I thought to be a solid wall. I was using him to sensor lock. While my others chucked over the wall to soften the mechs up a bit, I was in bad shape.
I couldn't believe it, I used the camera to pan around and couldn't see through a mech through the wall but just gave up and thought maybe the enemy was just that much of a badass gunner and put it through a peephole.
Later I started seeing ML's coming through whole chunks of mountains, and craggy pillars of rock that no matter which way I move the camera I cannot see both my mech, and the enemy. There is no SHOT.
The cheesy answer I got to this was that it was because gameplay is occurring dynamically, not statically so it is taking into account the mechs are "moving" during their firing turns when calculating hits... bull chips. The mech was standing still entrenched lobbing LRMS lol.
Never seems to happen with ballistics, PPC or LL and I can't do it to the enemy