Program: 159748
Project: 159748
Buggy source:
@Override public boolean apply(Game game,Ability source){
  Spell spell=game.getStack().getSpell(source.getFirstTarget());
  if (spell != null) {
    Targets targets=spell.getSpellAbility().getTargets();
    if (targets.size() == 1 && targets.get(0).getTargets().size() == 1) {
      Target target=targets.get(0);
      if (target.canTarget(source.getSourceId(),game)) {
        target.clearChosen();
        target.add(source.getSourceId(),game);
      }
    }
 else {
      Player player=game.getPlayer(source.getControllerId());
      for (      Target target : targets) {
        for (        UUID targetId : target.getTargets()) {
          MageObject object=game.getObject(targetId);
          String name=null;
          if (object == null) {
            Player targetPlayer=game.getPlayer(targetId);
            name=targetPlayer.getName();
          }
 else {
            name=object.getName();
          }
          if (name != null && player.chooseUse(Outcome.Neutral,"String_Node_Str" + name + "String_Node_Str",game)) {
            if (target.canTarget(source.getSourceId(),game)) {
              target.remove(targetId);
              target.addTarget(source.getSourceId(),source,game);
              break;
            }
          }
        }
      }
    }
  }
  return false;
}

Fixed version (ground truth):
@Override public boolean apply(Game game,Ability source){
  StackObject stackObject=game.getStack().getStackObject(source.getFirstTarget());
  MageObject sourceObject=game.getObject(source.getSourceId());
  if (stackObject != null && sourceObject != null) {
    Targets targets;
    MageObject oldTarget=null;
    if (stackObject instanceof Spell) {
      Spell spell=(Spell)stackObject;
      targets=spell.getSpellAbility().getTargets();
    }
 else     if (stackObject instanceof StackAbility) {
      StackAbility stackAbility=(StackAbility)stackObject;
      targets=stackAbility.getTargets();
    }
 else {
      return false;
    }
    if (targets.size() == 1 && targets.get(0).getTargets().size() == 1) {
      Target target=targets.get(0);
      if (target.canTarget(source.getSourceId(),game)) {
        oldTarget=game.getObject(targets.getFirstTarget());
        target.clearChosen();
        target.add(source.getSourceId(),game);
      }
    }
 else {
      Player player=game.getPlayer(source.getControllerId());
      for (      Target target : targets) {
        for (        UUID targetId : target.getTargets()) {
          MageObject object=game.getObject(targetId);
          String name;
          if (object == null) {
            Player targetPlayer=game.getPlayer(targetId);
            name=targetPlayer.getName();
          }
 else {
            name=object.getName();
          }
          if (name != null && player.chooseUse(Outcome.Neutral,new StringBuilder("String_Node_Str").append(name).append("String_Node_Str").append(sourceObject.getName()).append("String_Node_Str").toString(),game)) {
            if (target.canTarget(source.getSourceId(),game)) {
              oldTarget=game.getObject(targets.getFirstTarget());
              target.remove(targetId);
              target.addTarget(source.getSourceId(),source,game);
              break;
            }
          }
        }
      }
    }
    if (oldTarget != null) {
      game.informPlayers(new StringBuilder(sourceObject.getName()).append("String_Node_Str").append(stackObject.getName()).append("String_Node_Str").append(oldTarget.getName()).append("String_Node_Str").append(sourceObject.getName()).toString());
    }
    return true;
  }
  return false;
}