We had an issue a short while back with a new guy on our Zund. He'd been doing it a couple weeks by this point but still needed a helping hand. Anyway, after having spent a couple hours cutting sheets using the drag knife he paged the bed forward and, lo and behold, he'd been cutting through the conveyor the entire time. He watched in horror as the bed paged forward, falling apart and scattering all over the floor.
All in all the full 2.5m bed was shredded and had to be completely replaced. The remainder of the bed on the underside of the zund made for an excellent surface with which to cover the table used for hand-cutting though.