Program: 157698
Project: 157698
Buggy source:
@Override public boolean apply(Game game,Ability source){
  Player controller=game.getPlayer(source.getControllerId());
  if (controller != null) {
    List<Permanent> left=new ArrayList<>();
    List<Permanent> right=new ArrayList<>();
    for (    UUID defenderId : game.getCombat().getPlayerDefenders(game)) {
      Player defender=game.getPlayer(defenderId);
      if (defender != null) {
        List<Permanent> leftLog=new ArrayList<>();
        List<Permanent> rightLog=new ArrayList<>();
        FilterControlledCreaturePermanent filterBlockers=new FilterControlledCreaturePermanent("String_Node_Str");
        filterBlockers.add(Predicates.not(new AbilityPredicate(FlyingAbility.class)));
        Target target=new TargetControlledCreaturePermanent(0,Integer.MAX_VALUE,filterBlockers,true);
        if (target.canChoose(source.getSourceId(),defenderId,game)) {
          if (defender.chooseTarget(Outcome.Neutral,target,source,game)) {
            for (            Permanent permanent : game.getBattlefield().getAllActivePermanents(new FilterCreaturePermanent(),defenderId,game)) {
              if (target.getTargets().contains(permanent.getId())) {
                left.add(permanent);
                leftLog.add(permanent);
              }
 else               if (filterBlockers.match(permanent,source.getSourceId(),defenderId,game)) {
                right.add(permanent);
                rightLog.add(permanent);
              }
            }
          }
          StringBuilder sb=new StringBuilder("String_Node_Str").append(defender.getLogName()).append("String_Node_Str");
          sb.append(leftLog.stream().map(MageObject::getLogName).collect(Collectors.joining("String_Node_Str")));
          game.informPlayers(sb.toString());
          sb=new StringBuilder("String_Node_Str").append(defender.getLogName()).append("String_Node_Str");
          sb.append(rightLog.stream().map(MageObject::getLogName).collect(Collectors.joining("String_Node_Str")));
          game.informPlayers(sb.toString());
        }
      }
    }
    for (    UUID attackers : game.getCombat().getAttackers()) {
      Permanent attacker=game.getPermanent(attackers);
      if (attacker != null && attacker.getControllerId() == controller.getId()) {
        CombatGroup combatGroup=game.getCombat().findGroup(attacker.getId());
        if (combatGroup != null) {
          FilterCreaturePermanent filter=new FilterCreaturePermanent();
          Player defender=game.getPlayer(combatGroup.getDefendingPlayerId());
          if (defender != null) {
            if (left.isEmpty() && right.isEmpty()) {
              filter.add(Predicates.not(new AbilityPredicate(FlyingAbility.class)));
            }
 else {
              List<Permanent> leftLog=left.stream().filter(permanent -> permanent.getControllerId() != null).filter(permanent -> permanent.getControllerId().equals(defender.getId())).collect(Collectors.toList());
              List<Permanent> rightLog=right.stream().filter(permanent -> permanent.getControllerId() != null).filter(permanent -> permanent.getControllerId().equals(defender.getId())).collect(Collectors.toList());
              if (controller.choosePile(outcome,attacker.getName() + "String_Node_Str" + defender.getName(),leftLog,rightLog,game)) {
                filter.add(Predicates.not(Predicates.or(new AbilityPredicate(FlyingAbility.class),new PermanentInListPredicate(left))));
                game.informPlayers(attacker.getLogName() + "String_Node_Str" + defender.getLogName()+ "String_Node_Str");
              }
 else {
                filter.add(Predicates.not(Predicates.or(new AbilityPredicate(FlyingAbility.class),new PermanentInListPredicate(right))));
                game.informPlayers(attacker.getLogName() + "String_Node_Str" + defender.getLogName()+ "String_Node_Str");
              }
            }
            RestrictionEffect effect=new CantBeBlockedByAllTargetEffect(filter,Duration.EndOfCombat);
            effect.setTargetPointer(new FixedTarget(attacker.getId()));
            game.addEffect(effect,source);
          }
        }
      }
    }
    return true;
  }
  return false;
}

Fixed version (ground truth):
@Override public boolean apply(Game game,Ability source){
  Player controller=game.getPlayer(source.getControllerId());
  if (controller != null) {
    List<Permanent> left=new ArrayList<>();
    List<Permanent> right=new ArrayList<>();
    for (    UUID defenderId : game.getCombat().getPlayerDefenders(game)) {
      Player defender=game.getPlayer(defenderId);
      if (defender != null) {
        List<Permanent> leftLog=new ArrayList<>();
        List<Permanent> rightLog=new ArrayList<>();
        FilterControlledCreaturePermanent filterBlockers=new FilterControlledCreaturePermanent("String_Node_Str");
        filterBlockers.add(Predicates.not(new AbilityPredicate(FlyingAbility.class)));
        Target target=new TargetControlledCreaturePermanent(0,Integer.MAX_VALUE,filterBlockers,true);
        if (target.canChoose(source.getSourceId(),defenderId,game)) {
          if (defender.chooseTarget(Outcome.Neutral,target,source,game)) {
            for (            Permanent permanent : game.getBattlefield().getAllActivePermanents(new FilterCreaturePermanent(),defenderId,game)) {
              if (target.getTargets().contains(permanent.getId())) {
                left.add(permanent);
                leftLog.add(permanent);
              }
 else               if (filterBlockers.match(permanent,source.getSourceId(),defenderId,game)) {
                right.add(permanent);
                rightLog.add(permanent);
              }
            }
          }
          StringBuilder sb=new StringBuilder("String_Node_Str").append(defender.getLogName()).append("String_Node_Str");
          sb.append(leftLog.stream().map(MageObject::getLogName).collect(Collectors.joining("String_Node_Str")));
          game.informPlayers(sb.toString());
          sb=new StringBuilder("String_Node_Str").append(defender.getLogName()).append("String_Node_Str");
          sb.append(rightLog.stream().map(MageObject::getLogName).collect(Collectors.joining("String_Node_Str")));
          game.informPlayers(sb.toString());
        }
      }
    }
    for (    UUID attackers : game.getCombat().getAttackers()) {
      Permanent attacker=game.getPermanent(attackers);
      if (attacker != null && Objects.equals(attacker.getControllerId(),controller.getId())) {
        CombatGroup combatGroup=game.getCombat().findGroup(attacker.getId());
        if (combatGroup != null) {
          FilterCreaturePermanent filter=new FilterCreaturePermanent();
          Player defender=game.getPlayer(combatGroup.getDefendingPlayerId());
          if (defender != null) {
            if (left.isEmpty() && right.isEmpty()) {
              filter.add(Predicates.not(new AbilityPredicate(FlyingAbility.class)));
            }
 else {
              List<Permanent> leftLog=left.stream().filter(permanent -> permanent.getControllerId() != null).filter(permanent -> permanent.getControllerId().equals(defender.getId())).collect(Collectors.toList());
              List<Permanent> rightLog=right.stream().filter(permanent -> permanent.getControllerId() != null).filter(permanent -> permanent.getControllerId().equals(defender.getId())).collect(Collectors.toList());
              if (controller.choosePile(outcome,attacker.getName() + "String_Node_Str" + defender.getName(),leftLog,rightLog,game)) {
                filter.add(Predicates.not(Predicates.or(new AbilityPredicate(FlyingAbility.class),new PermanentInListPredicate(left))));
                game.informPlayers(attacker.getLogName() + "String_Node_Str" + defender.getLogName()+ "String_Node_Str");
              }
 else {
                filter.add(Predicates.not(Predicates.or(new AbilityPredicate(FlyingAbility.class),new PermanentInListPredicate(right))));
                game.informPlayers(attacker.getLogName() + "String_Node_Str" + defender.getLogName()+ "String_Node_Str");
              }
            }
            RestrictionEffect effect=new CantBeBlockedByAllTargetEffect(filter,Duration.EndOfCombat);
            effect.setTargetPointer(new FixedTarget(attacker.getId()));
            game.addEffect(effect,source);
          }
        }
      }
    }
    return true;
  }
  return false;
}