Why should a ball be taken if it hits the rough?
Which hole, which place?
There are certain areas where the rough "eats" the balls. KIA #2, far right of the landing zone, comes to mind.
Furthermore, WGTland has hidden "internal" OOB areas. That is when the ball flies far enough off the center to an adjactant track - STA is prominent in this effect. Those balls disappear regardless, sometimes while flying. It should start on #3 at least.
Edit: Nope! Try to reach green #17 from track #1 - impossible! (take cheap balls!)
The reason may be that they did not take photos there, in direction of this hole's green.
In general, the shape of the mini map is close to the "inbound" area of the holes.