Video shows a small flat rock that is impossible to cross. I strongly assume that this is a bug. Otherwise Gaijin changes that!
yeah rocks sometimes dont render in certain games. Happens to me all the time.
If you go in to the replay you will see the rock there.
There has also been some invisible obstacles as well, some objects (like tank corpse) visually despawn by the system but physically still in there, just yesterday I ran into one invisible tank corpse because it made a “ting” sound when I ran into them, it’s immovable. Then they also put some “zero traction” surface where its just impossible to drive