The Campaign’s got so many bugs, here are two more easily eye-catching :
Thor’s 250/330mm ability missing Muzzle Flash effect (WoL) (someone reported it long ago and no words from devs)
Protoss warp-in missing shape-forming effect
Now this invisible wall. REALLY blizzard?? I don’t really understand you. You messed up Co-op recently? And got no time to check out the Campaign’s bug? SHAME on you !! SHAME~!