Well, i think we have found the problem: you use couple of Forest objects to create the tiles of the parking zones (#Forest001 - parkingways and #Forest - parkingways stage1b), and boths objects are used as excluding areas for the trees. Futhermore, the parking objects changes dinamically with the camera clipping.
This workflow is not efficient, and also can generate strange results (as happens here), because there are multiple dependences between objects that change when camera moves.
To fix it, use the parking splines (@Line-parkingways and @Shape - stage1b parkingways) as excluding areas for the trees. This is much more simple and faster.