Set parent zone properly

src/engine/InterestManagement/Terrain.java

@@ -102,7 +102,7 @@ public class Terrain {
         // Retrieve the next zone with a terrain defined.
 
         Zone terrainZone = getNextZoneWithTerrain(zone);
-        Zone parentZone = getNextZoneWithTerrain(zone);
+        Zone parentZone = getNextZoneWithTerrain(zone.parent);
 
         // Transform world loc into zone space coordinate system