Program: 30623
Project: 30623
Buggy source:
public void swapRegions(World src,World dst,int x,int y,int z,int i,int j,int k,int scaleX,int scaleY,int scaleZ){
  BlockMatrixFrame blkMF=(BlockMatrixFrame)AEApi.instance().blocks().blockMatrixFrame.block();
  transverseEdges(i - 1,j - 1,k - 1,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1,new WrapInMatrixFrame(blkMF,0,dst));
  AxisAlignedBB srcBox=AxisAlignedBB.getBoundingBox(x,y,z,x + scaleX + 1,y + scaleY + 1,z + scaleZ + 1);
  AxisAlignedBB dstBox=AxisAlignedBB.getBoundingBox(i,j,k,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1);
  CachedPlane cDst=new CachedPlane(dst,i,j,k,i + scaleX,j + scaleY,k + scaleZ);
  CachedPlane cSrc=new CachedPlane(src,x,y,z,x + scaleX,y + scaleY,z + scaleZ);
  cSrc.Swap(cDst);
  List<Entity> srcE=src.getEntitiesWithinAABB(Entity.class,srcBox);
  List<Entity> dstE=dst.getEntitiesWithinAABB(Entity.class,dstBox);
  for (  Entity e : dstE) {
    teleportEntity(e,new TelDestination(src,srcBox,e.posX - i + x,e.posY - j + y,e.posZ - k + z));
  }
  for (  Entity e : srcE) {
    teleportEntity(e,new TelDestination(dst,dstBox,e.posX - x + i,e.posY - y + j,e.posZ - z + k));
  }
  for (  WorldCoord wc : cDst.updates)   cDst.wrld.notifyBlockOfNeighborChange(wc.x,wc.y,wc.z,Platform.air);
  for (  WorldCoord wc : cSrc.updates)   cSrc.wrld.notifyBlockOfNeighborChange(wc.x,wc.y,wc.z,Platform.air);
  transverseEdges(x - 1,y - 1,z - 1,x + scaleX + 1,y + scaleY + 1,z + scaleZ + 1,new triggerUpdates(src));
  transverseEdges(i - 1,j - 1,k - 1,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1,new triggerUpdates(dst));
  transverseEdges(x,y,z,x + scaleX,y + scaleY,z + scaleZ,new triggerUpdates(src));
  transverseEdges(i,j,k,i + scaleX,j + scaleY,k + scaleZ,new triggerUpdates(dst));
}

Fixed version (ground truth):
public void swapRegions(World src,World dst,int x,int y,int z,int i,int j,int k,int scaleX,int scaleY,int scaleZ){
  BlockMatrixFrame blkMF=(BlockMatrixFrame)AEApi.instance().blocks().blockMatrixFrame.block();
  transverseEdges(i - 1,j - 1,k - 1,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1,new WrapInMatrixFrame(blkMF,0,dst));
  AxisAlignedBB srcBox=AxisAlignedBB.getBoundingBox(x,y,z,x + scaleX + 1,y + scaleY + 1,z + scaleZ + 1);
  AxisAlignedBB dstBox=AxisAlignedBB.getBoundingBox(i,j,k,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1);
  CachedPlane cDst=new CachedPlane(dst,i,j,k,i + scaleX,j + scaleY,k + scaleZ);
  CachedPlane cSrc=new CachedPlane(src,x,y,z,x + scaleX,y + scaleY,z + scaleZ);
  cSrc.Swap(cDst);
  List<Entity> srcE=src.getEntitiesWithinAABB(Entity.class,srcBox);
  List<Entity> dstE=dst.getEntitiesWithinAABB(Entity.class,dstBox);
  for (  Entity e : dstE) {
    teleportEntity(e,new TelDestination(src,srcBox,e.posX,e.posY,e.posZ,-i + x,-j + y,-k + z));
  }
  for (  Entity e : srcE) {
    teleportEntity(e,new TelDestination(dst,dstBox,e.posX,e.posY,e.posZ,-x + i,-y + j,-z + k));
  }
  for (  WorldCoord wc : cDst.updates)   cDst.wrld.notifyBlockOfNeighborChange(wc.x,wc.y,wc.z,Platform.air);
  for (  WorldCoord wc : cSrc.updates)   cSrc.wrld.notifyBlockOfNeighborChange(wc.x,wc.y,wc.z,Platform.air);
  transverseEdges(x - 1,y - 1,z - 1,x + scaleX + 1,y + scaleY + 1,z + scaleZ + 1,new triggerUpdates(src));
  transverseEdges(i - 1,j - 1,k - 1,i + scaleX + 1,j + scaleY + 1,k + scaleZ + 1,new triggerUpdates(dst));
  transverseEdges(x,y,z,x + scaleX,y + scaleY,z + scaleZ,new triggerUpdates(src));
  transverseEdges(i,j,k,i + scaleX,j + scaleY,k + scaleZ,new triggerUpdates(dst));
}