Manually created System does not update

Hi,
I have similar problem as our frind two years ago https://forum.unity.com/threads/manually-created-system-does-not-update.882085/
I have system that work fine when its created in default way. But when I add DisableAutoCreation attribute and use World.CreateSystem - this system added to World.AllSystems list, but not added to any SystemGroup, even not in Simulation group. That's probably why its not updated.
Fearing some complex hidden mistakes i create new test system which also work fine without DisableAutoCreation attribute.

Code (CSharp):

1. namespace Core.Systems.Simulation.Battle
2. {
3.     [DisableAutoCreation]
4.     public partial class TestSystem : SystemBase
5.     {
6.         protected override void OnCreate()
7.         {
8.             RequireSingletonForUpdate<BattleData>();
9.             Debug.LogError("I am created");
10.         }
11.  
12.         protected override void OnUpdate()
13.         {
14.             Debug.LogError("I am alive");
15.         }
16.     }
17. }

And when I add DisableAutoCreation and create this system through World.CreateSystem, this sistem also added to World.AllSystems list, but not added to any SystemGroup. And also not updated.

I also try using World.AddSystem, World.GetOrCreateSystem with expected same result.

P.S. I need to create system by myself to be able to add readonly static struct to my system. This struct is map data so its immuatable. So I won't to add local variable and copy all this big data on each frame.
Do you know the best way to solve this problem?

Code (CSharp):

1.  protected override void OnUpdate()
2. {
3.         var mapData = this.mapData;
4.         // using map data in job
5. }

 

You could get one of the existing system groups (whichever specific one you're using) and call

group.AddSystemToUpdateList(yourSystem)

.

 

Thanks this resolve my problem.
Very strange that i don't find mentions about requirness of this call in docs at least in chapter Worlds - Managing systems.
Expected behaviour - i already described system group by attribute in system, so when I am creating system it whould be added to described system group byself (by World.CreateSystem)

 

I feel that the systems with [DisableAutoCreation] should not be Auto-created, but should be Auto-updated upon creation, especially when [AlwaysUpdateSystem] is deprecated.

By the way, I start the system with [DisableAutoCreation] in ISystem with command World.DefaultGameObjectInjectionWorld.GetExistingSystemManaged<SimulationSystemGroup>().AddSystemToUpdateList(World.DefaultGameObjectInjectionWorld.CreateSystem<YourDisableAutoCreationSystemName>());
That way the system is created and updates in SimulationSystemGroup.