Program: 173613
Project: 173613
Buggy source:
public boolean layTile(LayTile action){
  String errMsg=null;
  int cost=0;
  SpecialTileLay stl=null;
  boolean extra=false;
  PublicCompanyI company=action.getCompany();
  String companyName=company.getName();
  TileI tile=action.getLaidTile();
  MapHex hex=action.getChosenHex();
  int orientation=action.getOrientation();
  while (true) {
    if (!companyName.equals(operatingCompany.get().getName())) {
      errMsg=LocalText.getText("String_Node_Str",companyName,operatingCompany.get().getName());
      break;
    }
    if (getStep() != GameDef.OrStep.LAY_TRACK) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    if (tile == null)     break;
    if (!getCurrentPhase().isTileColourAllowed(tile.getColourName())) {
      errMsg=LocalText.getText("String_Node_Str",tile.getExternalId());
      break;
    }
    if (tile.countFreeTiles() == 0) {
      errMsg=LocalText.getText("String_Node_Str",tile.getExternalId());
      break;
    }
    if (action != null) {
      List<TileI> tiles=action.getTiles();
      if (tiles != null && !tiles.isEmpty() && !tiles.contains(tile)) {
        errMsg=LocalText.getText("String_Node_Str",tile.getExternalId(),hex.getName());
        break;
      }
      stl=action.getSpecialProperty();
      if (stl != null)       extra=stl.isExtra();
    }
    if (!extra && !validateNormalTileLay(tile)) {
      errMsg=LocalText.getText("String_Node_Str",tile.getColourName());
      break;
    }
    if (stl != null && stl.isFree()) {
      cost=0;
    }
 else {
      cost=hex.getTileCost();
    }
    if (cost < 0) {
      errMsg=LocalText.getText("String_Node_Str",Bank.format(cost));
      break;
    }
    if (cost % 10 != 0) {
      errMsg=LocalText.getText("String_Node_Str",Bank.format(cost));
      break;
    }
    if (cost > operatingCompany.get().getCash()) {
      errMsg=LocalText.getText("String_Node_Str",companyName,Bank.format(operatingCompany.get().getCash()),Bank.format(cost));
      break;
    }
    break;
  }
  if (errMsg != null) {
    DisplayBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),Bank.format(cost),errMsg));
    return false;
  }
  moveStack.start(true);
  if (tile != null) {
    if (cost > 0)     new CashMove(operatingCompany.get(),bank,cost);
    operatingCompany.get().layTile(hex,tile,orientation,cost);
    if (cost == 0) {
      ReportBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),hex.getOrientationName(orientation)));
    }
 else {
      ReportBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),hex.getOrientationName(orientation),Bank.format(cost)));
    }
    hex.upgrade(action);
    if (stl != null) {
      stl.setExercised();
      currentSpecialTileLays.remove(action);
      log.debug("String_Node_Str" + (extra ? "String_Node_Str" : "String_Node_Str") + "String_Node_Str");
    }
    if (!extra) {
      log.debug("String_Node_Str");
      registerNormalTileLay(tile);
    }
    setSpecialTileLays();
    log.debug("String_Node_Str" + currentSpecialTileLays.size() + "String_Node_Str");
  }
  if (tile == null || currentNormalTileLays.isEmpty() && currentSpecialTileLays.isEmpty()) {
    nextStep();
  }
  return true;
}

Fixed version (ground truth):
public boolean layTile(LayTile action){
  String errMsg=null;
  int cost=0;
  SpecialTileLay stl=null;
  boolean extra=false;
  PublicCompanyI company=action.getCompany();
  String companyName=company.getName();
  TileI tile=action.getLaidTile();
  MapHex hex=action.getChosenHex();
  int orientation=action.getOrientation();
  while (true) {
    if (!companyName.equals(operatingCompany.get().getName())) {
      errMsg=LocalText.getText("String_Node_Str",companyName,operatingCompany.get().getName());
      break;
    }
    if (getStep() != GameDef.OrStep.LAY_TRACK) {
      errMsg=LocalText.getText("String_Node_Str");
      break;
    }
    if (tile == null)     break;
    if (!getCurrentPhase().isTileColourAllowed(tile.getColourName())) {
      errMsg=LocalText.getText("String_Node_Str",tile.getExternalId());
      break;
    }
    if (tile.countFreeTiles() == 0) {
      errMsg=LocalText.getText("String_Node_Str",tile.getExternalId());
      break;
    }
    if (action != null) {
      List<TileI> tiles=action.getTiles();
      if (tiles != null && !tiles.isEmpty() && !tiles.contains(tile)) {
        errMsg=LocalText.getText("String_Node_Str",tile.getExternalId(),hex.getName());
        break;
      }
      stl=action.getSpecialProperty();
      if (stl != null)       extra=stl.isExtra();
    }
    if (!extra && !validateNormalTileLay(tile)) {
      errMsg=LocalText.getText("String_Node_Str",tile.getColourName());
      break;
    }
    if (stl != null && stl.isFree()) {
      cost=0;
    }
 else {
      cost=hex.getTileCost();
    }
    if (cost < 0) {
      errMsg=LocalText.getText("String_Node_Str",Bank.format(cost));
      break;
    }
    if (cost % 10 != 0) {
      errMsg=LocalText.getText("String_Node_Str",Bank.format(cost));
      break;
    }
    if (cost > operatingCompany.get().getCash()) {
      errMsg=LocalText.getText("String_Node_Str",companyName,Bank.format(operatingCompany.get().getCash()),Bank.format(cost));
      break;
    }
    break;
  }
  if (errMsg != null) {
    DisplayBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),Bank.format(cost),errMsg));
    return false;
  }
  moveStack.start(true);
  if (tile != null) {
    if (cost > 0)     new CashMove(operatingCompany.get(),bank,cost);
    operatingCompany.get().layTile(hex,tile,orientation,cost);
    if (cost == 0) {
      ReportBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),hex.getOrientationName(orientation)));
    }
 else {
      ReportBuffer.add(LocalText.getText("String_Node_Str",companyName,tile.getExternalId(),hex.getName(),hex.getOrientationName(orientation),Bank.format(cost)));
    }
    hex.upgrade(action);
    if (stl != null) {
      stl.setExercised();
      log.debug("String_Node_Str" + (extra ? "String_Node_Str" : "String_Node_Str") + "String_Node_Str");
    }
    if (!extra) {
      log.debug("String_Node_Str");
      registerNormalTileLay(tile);
    }
  }
  if (tile == null || !areTileLaysPossible()) {
    nextStep();
  }
  return true;
}