Program: 157736
Project: 157736
Buggy source:
private void checkTrigger(TriggeredAbility ability,GameEvent event,Game game){
  MageObject object=game.getObject(ability.getSourceId());
  if (ability.isInUseableZone(game,object,event)) {
    if (event == null || !game.getContinuousEffects().preventedByRuleModification(event,ability,game,false)) {
      if (object != null) {
        boolean controllerSet=false;
        if (ability.getZone() != Zone.COMMAND && event != null && event.getTargetId() != null && ability.isLeavesTheBattlefieldTrigger() && game.getLKI().get(Zone.BATTLEFIELD) != null && game.getLKI().get(Zone.BATTLEFIELD).containsKey(ability.getSourceId())) {
          Permanent permanent=(Permanent)game.getLastKnownInformation(ability.getSourceId(),Zone.BATTLEFIELD,ability.getSourceObjectZoneChangeCounter() - 1);
          if (permanent != null) {
            if (!ability.getWorksFaceDown() && permanent.isFaceDown(game)) {
              return;
            }
            controllerSet=true;
            ability.setControllerId(permanent.getControllerId());
          }
        }
        if (!controllerSet) {
          if (object instanceof Permanent) {
            ability.setControllerId(((Permanent)object).getControllerId());
          }
 else           if (object instanceof Spell) {
            ability.setControllerId(((Spell)object).getControllerId());
          }
        }
      }
      if (ability.checkTrigger(event,game)) {
        NumberOfTriggersEvent numberOfTriggersEvent=new NumberOfTriggersEvent(ability.getControllerId(),ability.getSourceId(),event);
        if (!game.replaceEvent(numberOfTriggersEvent)) {
          for (int i=0; i < numberOfTriggersEvent.getAmount(); i++) {
            ability.trigger(game,ability.getControllerId());
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
private void checkTrigger(TriggeredAbility ability,GameEvent event,Game game){
  MageObject object=game.getObject(ability.getSourceId());
  if (ability.isInUseableZone(game,object,event)) {
    if (event == null || !game.getContinuousEffects().preventedByRuleModification(event,ability,game,false)) {
      if (object != null) {
        boolean controllerSet=false;
        if (ability.getZone() != Zone.COMMAND && event != null && event.getTargetId() != null && ability.isLeavesTheBattlefieldTrigger() && game.getLKI().get(Zone.BATTLEFIELD) != null && game.getLKI().get(Zone.BATTLEFIELD).containsKey(ability.getSourceId())) {
          Permanent permanent=(Permanent)game.getLastKnownInformation(ability.getSourceId(),Zone.BATTLEFIELD,ability.getSourceObjectZoneChangeCounter() - 1);
          if (permanent != null) {
            if (permanent.isFaceDown(game) && !isGainedAbility(ability,permanent) && !ability.getWorksFaceDown()) {
              return;
            }
            controllerSet=true;
            ability.setControllerId(permanent.getControllerId());
          }
        }
        if (!controllerSet) {
          if (object instanceof Permanent) {
            ability.setControllerId(((Permanent)object).getControllerId());
          }
 else           if (object instanceof Spell) {
            ability.setControllerId(((Spell)object).getControllerId());
          }
        }
      }
      if (ability.checkTrigger(event,game)) {
        NumberOfTriggersEvent numberOfTriggersEvent=new NumberOfTriggersEvent(ability.getControllerId(),ability.getSourceId(),event);
        if (!game.replaceEvent(numberOfTriggersEvent)) {
          for (int i=0; i < numberOfTriggersEvent.getAmount(); i++) {
            ability.trigger(game,ability.getControllerId());
          }
        }
      }
    }
  }
}