We'll try to have a look at this but, the issue with LSZH is that it lies in a very unlucky position, with the boundary of the QMID (which is a grid of terrain data) crossing the airport and the runways, and this cause issues with any correction we try to make, if the correction polygon is crossed by that boundary, it results in the terraforming correction polygon being automatically split by the sim (because it crosses the QMID boundary) and due to what seems to be a bug in the sim terrain engine, when two terraforming polygons meet with each other, it would result in a very bad hard step on their junction.
Which again, is not something we made: it's the result of the simulator splitting the polygon in two *because* the airport crosses over a QMID boundary, so our correction doesn't work the way we wanted.
So, again, I'll try to have another look at it but, if this is the issue, it might not be possible to fix it, other than "cheat" and make the whole airport completely flat like in FSX, which will then cause other effects on the borders, since the area around is not flat.