Program: 133886
Project: 133886
Buggy source:
public void manageAirVectors(){
  for (int i=0; i < tasks.size(); i++) {
    if (((FireComboStream)tasks.get(i)).isCancelled()) {
      tasks.remove(i);
      i--;
    }
  }
  if (tasks.size() == 0) {
    remove();
    return;
  }
  for (int i=0; i < tasks.size(); i++) {
    FireComboStream fstream=(FireComboStream)tasks.get(i);
    Location loc=fstream.getLocation();
    if (GeneralMethods.isRegionProtectedFromBuild(this,loc)) {
      fstream.remove();
      return;
    }
    if (!isTransparent(loc.getBlock())) {
      if (!isTransparent(loc.clone().add(0,0.2,0).getBlock())) {
        fstream.remove();
        return;
      }
    }
    if (i % 3 == 0) {
      for (      Entity entity : GeneralMethods.getEntitiesAroundPoint(loc,2.5)) {
        if (GeneralMethods.isRegionProtectedFromBuild(this,entity.getLocation())) {
          remove();
          return;
        }
        if (!entity.equals(player) && !affectedEntities.contains(entity)) {
          affectedEntities.add(entity);
          if (knockback != 0) {
            Vector force=fstream.getDirection();
            entity.setVelocity(force.multiply(knockback));
          }
          if (damage != 0) {
            if (entity instanceof LivingEntity) {
              if (fstream.getAbility().equalsIgnoreCase("String_Node_Str")) {
                DamageHandler.damageEntity(entity,damage,this);
              }
 else {
                DamageHandler.damageEntity(entity,damage,this);
              }
            }
          }
        }
      }
      if (GeneralMethods.blockAbilities(player,FireCombo.getBlockableAbilities(),loc,1)) {
        fstream.remove();
      }
    }
  }
}

Fixed version (ground truth):
public void manageAirVectors(){
  for (int i=0; i < tasks.size(); i++) {
    if (((FireComboStream)tasks.get(i)).isCancelled()) {
      tasks.remove(i);
      i--;
    }
  }
  if (tasks.size() == 0) {
    remove();
    return;
  }
  for (int i=0; i < tasks.size(); i++) {
    FireComboStream fstream=(FireComboStream)tasks.get(i);
    Location loc=fstream.getLocation();
    if (GeneralMethods.isRegionProtectedFromBuild(this,loc)) {
      fstream.remove();
      return;
    }
    if (!isTransparent(loc.getBlock())) {
      if (!isTransparent(loc.clone().add(0,0.2,0).getBlock())) {
        fstream.remove();
        return;
      }
    }
    if (i % 3 == 0) {
      for (      Entity entity : GeneralMethods.getEntitiesAroundPoint(loc,2.5)) {
        if (GeneralMethods.isRegionProtectedFromBuild(this,entity.getLocation())) {
          remove();
          return;
        }
        if (!entity.equals(player) && !affectedEntities.contains(entity)) {
          affectedEntities.add(entity);
          if (knockback != 0) {
            Vector force=fstream.getDirection();
            entity.setVelocity(force.multiply(knockback));
          }
          if (damage != 0) {
            if (entity instanceof LivingEntity) {
              if (fstream.getAbility().equalsIgnoreCase("String_Node_Str")) {
                DamageHandler.damageEntity(entity,damage,this);
              }
 else {
                DamageHandler.damageEntity(entity,damage,this);
              }
            }
          }
        }
      }
      if (GeneralMethods.blockAbilities(player,FireCombo.getBlockableAbilities(),loc,1)) {
        fstream.remove();
      }
 else       AirAbility.removeAirSpouts(loc,player);
      WaterAbility.removeWaterSpouts(loc,player);
      EarthAbility.removeSandSpouts(loc,player);
    }
  }
}