Program: 173544
Project: 173544
Buggy source:
@Override public boolean process(PossibleAction action){
  boolean result=false;
  doneAllowed=false;
  if (action instanceof PossibleORAction && !(action instanceof DiscardTrain)) {
    PublicCompany company=((PossibleORAction)action).getCompany();
    if (company != operatingCompany.value()) {
      DisplayBuffer.add(LocalText.getText("String_Node_Str",company.getId(),operatingCompany.value().getId()));
      return false;
    }
  }
  selectedAction=action;
  if (selectedAction instanceof LayTile) {
    result=layTile((LayTile)selectedAction);
  }
 else   if (selectedAction instanceof LayBaseToken) {
    result=layBaseToken((LayBaseToken)selectedAction);
  }
 else   if (selectedAction instanceof LayBonusToken) {
    result=layBonusToken((LayBonusToken)selectedAction);
  }
 else   if (selectedAction instanceof BuyBonusToken) {
    result=buyBonusToken((BuyBonusToken)selectedAction);
  }
 else   if (selectedAction instanceof OperatingCost) {
    result=executeOperatingCost((OperatingCost)selectedAction);
  }
 else   if (selectedAction instanceof SetDividend) {
    result=setRevenueAndDividend((SetDividend)selectedAction);
  }
 else   if (selectedAction instanceof BuyTrain) {
    result=buyTrain((BuyTrain)selectedAction);
  }
 else   if (selectedAction instanceof DiscardTrain) {
    result=discardTrain((DiscardTrain)selectedAction);
  }
 else   if (selectedAction instanceof BuyPrivate) {
    result=buyPrivate((BuyPrivate)selectedAction);
  }
 else   if (selectedAction instanceof ReachDestinations) {
    result=reachDestinations((ReachDestinations)selectedAction);
  }
 else   if (selectedAction instanceof TakeLoans) {
    result=takeLoans((TakeLoans)selectedAction);
  }
 else   if (selectedAction instanceof RepayLoans) {
    result=repayLoans((RepayLoans)selectedAction);
  }
 else   if (selectedAction instanceof ExchangeTokens) {
    result=exchangeTokens((ExchangeTokens)selectedAction,false);
  }
 else   if (selectedAction instanceof ClosePrivate) {
    result=executeClosePrivate((ClosePrivate)selectedAction);
  }
 else   if (selectedAction instanceof UseSpecialProperty && ((UseSpecialProperty)selectedAction).getSpecialProperty() instanceof SpecialRight) {
    result=buyRight((UseSpecialProperty)selectedAction);
  }
 else   if (selectedAction instanceof NullAction) {
    NullAction nullAction=(NullAction)action;
switch (nullAction.getMode()) {
case NullAction.DONE:
case NullAction.PASS:
      result=done();
    break;
case NullAction.SKIP:
  skip();
result=true;
break;
}
}
 else if (processGameSpecificAction(action)) {
result=true;
}
 else {
DisplayBuffer.add(LocalText.getText("String_Node_Str",selectedAction.toString()));
return false;
}
return result;
}

Fixed version (ground truth):
@Override public boolean process(PossibleAction action){
  boolean result=false;
  doneAllowed=false;
  if (action instanceof PossibleORAction && !(action instanceof DiscardTrain)) {
    PublicCompany company=((PossibleORAction)action).getCompany();
    if (company != operatingCompany.value()) {
      DisplayBuffer.add(LocalText.getText("String_Node_Str",company.getId(),operatingCompany.value().getId()));
      return false;
    }
  }
  selectedAction=action;
  if (selectedAction instanceof LayTile) {
    result=layTile((LayTile)selectedAction);
  }
 else   if (selectedAction instanceof LayBaseToken) {
    result=layBaseToken((LayBaseToken)selectedAction);
  }
 else   if (selectedAction instanceof LayBonusToken) {
    result=layBonusToken((LayBonusToken)selectedAction);
  }
 else   if (selectedAction instanceof BuyBonusToken) {
    result=buyBonusToken((BuyBonusToken)selectedAction);
  }
 else   if (selectedAction instanceof OperatingCost) {
    result=executeOperatingCost((OperatingCost)selectedAction);
  }
 else   if (selectedAction instanceof SetDividend) {
    result=setRevenueAndDividend((SetDividend)selectedAction);
  }
 else   if (selectedAction instanceof BuyTrain) {
    result=buyTrain((BuyTrain)selectedAction);
  }
 else   if (selectedAction instanceof DiscardTrain) {
    result=discardTrain((DiscardTrain)selectedAction);
  }
 else   if (selectedAction instanceof BuyPrivate) {
    result=buyPrivate((BuyPrivate)selectedAction);
  }
 else   if (selectedAction instanceof ReachDestinations) {
    result=reachDestinations((ReachDestinations)selectedAction);
  }
 else   if (selectedAction instanceof TakeLoans) {
    result=takeLoans((TakeLoans)selectedAction);
  }
 else   if (selectedAction instanceof RepayLoans) {
    result=repayLoans((RepayLoans)selectedAction);
  }
 else   if (selectedAction instanceof ExchangeTokens) {
    result=exchangeTokens((ExchangeTokens)selectedAction,false);
  }
 else   if (selectedAction instanceof ClosePrivate) {
    result=executeClosePrivate((ClosePrivate)selectedAction);
  }
 else   if (selectedAction instanceof UseSpecialProperty && ((UseSpecialProperty)selectedAction).getSpecialProperty() instanceof SpecialRight) {
    result=buyRight((UseSpecialProperty)selectedAction);
  }
 else   if (selectedAction instanceof NullAction) {
    NullAction nullAction=(NullAction)action;
switch (nullAction.getMode()) {
case NullAction.DONE:
case NullAction.PASS:
      result=done(nullAction);
    break;
case NullAction.SKIP:
  skip();
result=true;
break;
}
}
 else if (processGameSpecificAction(action)) {
result=true;
}
 else {
DisplayBuffer.add(LocalText.getText("String_Node_Str",selectedAction.toString()));
return false;
}
return result;
}