When Saunders and the other two are riding in the tank past the Jeep they were in when it hit the mine, there is no indication in the road that there was any explosion. There is just the Jeep, tipped on its side.
When the two German soldiers, on foot, find the shot up German vehicle and dead soldiers, they turn to start walking back to the other Germans to tell what they found. They didn't try to see if the vehicle was still in running condition. It was.