Never seen this before but something somewhat similar happened to me in the London Streets map. I was walking near where one of the tanks comes through (it was the very begining of the match so it's going to be a while before the tank comes). I'm hanging on one of the walls that block the street off where out of no where, the wall explodes as if the tank went through it (which it didn't). I was laughing though as seeing the wall randomly explode for no reason was pretty funny, even though it killed me lol.
Happens a lot. It's like the glitch where the walls for Deathmatch are present on London Streets for some people even in Plunder. You can't go through, but people for whom the wall isn't there, run through like ghosts.
I suspect the wall is there for some, not for others.