Component System OnUpdate Running Unintentionally in Other Scenes (Including New Ones) - unity3d

Question

I have a class that inherits from ComponentSystem in ECS and for some reason the OnUpdate function is being called unintentionally in every scene. Even if I create a new blank scene, the loop is running (and throwing errors).
How can I fix this?
Code below.
public class TransportSpriteSystem : ComponentSystem
{
//Updates the sprites for transport movement
public static float timer = 0f;
LogisticTransportConnection target;
protected override void OnUpdate()
{
if (!LogisticManager.I.useEntities)
return;
if (timer >= LogisticManager.I.tickRate)
{
Entities.ForEach((Entity entity, ref TransportSpriteComponent sprite) =>
{
target = LogisticTransportConnection.All[sprite.connectionId];
int newId = target.TransportQueueIds[sprite.spriteIndex];
if (target.line.isVisible && sprite.lastId != newId)
{
EntityManager.SetSharedComponentData(entity, InventoryManager.I.itemRenderMeshes[newId]);
sprite.lastId = newId;
}
});
timer = 0f;
}
else
{
timer += Time.DeltaTime;
}
}
}
public class TransportSpriteSystemMovement : SystemBase
{
//Responsible for smoothly moving the sprites
protected override void OnUpdate()
{
GameManager.stopwatch2.Restart();
float lerpVal = TransportSpriteSystem.timer / LogisticManager.I.tickRate;
Entities.ForEach((ref TransportSpriteComponent sprite, ref TransportSpriteComponentCanMove canMove, ref Translation translation) =>
{
if (canMove.canMove)
translation.Value = Vector3.Lerp(sprite.start, sprite.end, lerpVal);
}).ScheduleParallel();
GameManager.stopwatch2.Stop();
UIDebug.Set(3, $"Pos Lerp Tick: {GameManager.StopwatchMilliSecondsAvg2.ToString("0.000")}ms");
}
}

Answer 1

The most immediate yet blunt solution here is to control OnUpdate calls with Enabled property; when set to false it will disable OnUpdate from being called:
protected override void OnCreate ()
{
this.Enabled = condition;
}