Program: 82606
Project: 82606
Buggy source:
/** 
 * @param bounds bounds of the target area (points from Voronoi will be scaled and translated accordingly)
 * @param v the Voronoi diagram to use
 */
public VoronoiGraph(Rect2i bounds,Voronoi v){
  intBounds=bounds;
  realBounds=Rect2f.createFromMinAndSize(bounds.minX(),bounds.minY(),bounds.width(),bounds.height());
  final Map<Vector2f,Region> pointCenterMap=new HashMap<>();
  final Map<BaseVector2f,Corner> pointCornerMap=new HashMap<>();
  for (  Vector2f vorSite : v.siteCoords()) {
    Vector2f site=transform(v.getPlotBounds(),realBounds,vorSite);
    Region region=new Region(new ImmutableVector2f(site));
    regions.add(region);
    pointCenterMap.put(site,region);
    for (    Vector2f cput : v.region(vorSite)) {
      Vector2f cpt=transform(v.getPlotBounds(),realBounds,cput);
      Corner c0=makeCorner(pointCornerMap,cpt);
      region.addCorner(c0);
      c0.addTouches(region);
    }
  }
  v.regions();
  final List<org.terasology.math.delaunay.Edge> libedges=v.edges();
  for (  org.terasology.math.delaunay.Edge libedge : libedges) {
    final LineSegment vEdge=libedge.voronoiEdge();
    final LineSegment dEdge=libedge.delaunayLine();
    if (vEdge == null) {
      continue;
    }
    Vector2f cp0=transform(v.getPlotBounds(),realBounds,vEdge.getStart());
    Vector2f cp1=transform(v.getPlotBounds(),realBounds,vEdge.getEnd());
    Corner c0=makeCorner(pointCornerMap,cp0);
    Corner c1=makeCorner(pointCornerMap,cp1);
    Vector2f rp0=transform(v.getPlotBounds(),realBounds,dEdge.getStart());
    Vector2f rp1=transform(v.getPlotBounds(),realBounds,dEdge.getEnd());
    Region r0=pointCenterMap.get(rp0);
    Region r1=pointCenterMap.get(rp1);
    final Edge edge=new Edge(c0,c1,r0,r1);
    edges.add(edge);
    r0.addBorder(edge);
    r1.addBorder(edge);
    c0.addEdge(edge);
    c1.addEdge(edge);
    r0.addNeigbor(r1);
    r1.addNeigbor(r0);
    c0.addAdjacent(c1);
    c1.addAdjacent(c0);
  }
}

Fixed version (ground truth):
/** 
 * @param bounds bounds of the target area (points from Voronoi will be scaled and translated accordingly)
 * @param v the Voronoi diagram to use
 */
public VoronoiGraph(Rect2i bounds,Voronoi v){
  intBounds=bounds;
  realBounds=Rect2f.createFromMinAndSize(bounds.minX(),bounds.minY(),bounds.width(),bounds.height());
  final Map<Vector2f,Region> regionMap=new HashMap<>();
  final Map<BaseVector2f,Corner> pointCornerMap=new HashMap<>();
  for (  Vector2f vorSite : v.siteCoords()) {
    Vector2f site=transform(v.getPlotBounds(),realBounds,vorSite);
    Region region=new Region(new ImmutableVector2f(site));
    regions.add(region);
    regionMap.put(vorSite,region);
    for (    Vector2f pt : v.region(vorSite)) {
      Corner c0=makeCorner(pointCornerMap,v.getPlotBounds(),pt);
      region.addCorner(c0);
      c0.addTouches(region);
    }
  }
  for (  org.terasology.math.delaunay.Edge libedge : v.edges()) {
    if (!libedge.isVisible()) {
      continue;
    }
    final LineSegment dEdge=libedge.delaunayLine();
    final LineSegment vEdge=libedge.voronoiEdge();
    Corner c0=makeCorner(pointCornerMap,v.getPlotBounds(),vEdge.getStart());
    Corner c1=makeCorner(pointCornerMap,v.getPlotBounds(),vEdge.getEnd());
    Region r0=regionMap.get(dEdge.getStart());
    Region r1=regionMap.get(dEdge.getEnd());
    final Edge edge=new Edge(c0,c1,r0,r1);
    edges.add(edge);
    r0.addBorder(edge);
    r1.addBorder(edge);
    c0.addEdge(edge);
    c1.addEdge(edge);
    r0.addNeigbor(r1);
    r1.addNeigbor(r0);
    c0.addAdjacent(c1);
    c1.addAdjacent(c0);
  }
}