Turrets shoot ghost targets

Turrets often start shooting nonexisting targets, wasting ammo indefinitely. Or not shoot missiles, when there are missiles flying.

That's how to reproduce: https://www.youtube.com/watch?v=yabgroA_OzI&feature=youtu.be

Here's the script, that fixes the problem with shooting ghost targets:

List<TurretWatchdog> Watchdogs;
IEnumerator<TurretWatchdog> WatchdogEnumerator = null;

Program()
{
    List<IMyLargeTurretBase> Turrets = new List<IMyLargeTurretBase>();
    GridTerminalSystem.GetBlocksOfType<IMyLargeTurretBase>(Turrets);

    Watchdogs = Turrets.Select(t => new TurretWatchdog(t)).ToList();

    if (Watchdogs.Any())
        Runtime.UpdateFrequency = UpdateFrequency.Update1;
    else
        Echo("No turrets found");
}

class TurretWatchdog
{

    IMyLargeTurretBase Turret;

    MyDetectedEntityInfo PreviousEntity;

    public TurretWatchdog(IMyLargeTurretBase turret)
    {
        Turret = turret;
        PreviousEntity = turret.GetTargetedEntity();
    }

    public void Check()
    {
        var entity = Turret.GetTargetedEntity();

        if (entity.TimeStamp == PreviousEntity.TimeStamp)
            return;

        if (entity.BoundingBox == PreviousEntity.BoundingBox && entity.Velocity == PreviousEntity.Velocity && !Vector3D.IsZero(entity.Velocity))
        {
            var idleRotation = Turret.EnableIdleRotation;
            Turret.ResetTargetingToDefault();
            Turret.EnableIdleRotation = idleRotation;
        }

        PreviousEntity = entity;
    }
}

void Main()
{
    if (WatchdogEnumerator == null || !WatchdogEnumerator.MoveNext())
    {
        WatchdogEnumerator = Watchdogs.GetEnumerator();
        WatchdogEnumerator.MoveNext();
    }

    WatchdogEnumerator.Current.Check();
}