I have seen video of that assault where the engineering vehicle detonates a mine with it's plow, backs up and then continues to breech. Since the video ended where there an explosion and no aftermath. You can't be sure this breech failed. Particularly in the video I saw, they pushed light AFV's through the breech, which you would not do in a failed breech. I suspect this breech is the new one that has punched in west of the contested line and threatens the rear of the Naval Infantry units. In the video I saw a near miss by a ATGM, so the defenses were somewhat defended.