Adding component using PostUpdateCommands deallocates array? (hybrid)

At the time of running, there's an entity (E1) in the system with the component MyComponent (struct). There's also a system that iterates over all entities with MyComponent.

When (in that system) a new entity (E2) is created from a gameobject, scheduling a copy of MyComponent to be added to E2 using PostUpdateCommands seems to deallocate the ComponentDataArray holding E1's component.

Code (CSharp):

1. public class MyEntitySystem : ComponentSystem {  
2.  
3.     public struct Data {
4.  
5.         public ComponentDataArray<MyComponent> MyComponents;
6.         public int Length;
7.  
8.     }
9.  
10.     [Inject] Data myData;
11.  
12.     protected override void OnUpdate() {
13.  
14.         // Step 1: Create a new entity/gameobject
15.         var prefab = (GameObject)Resources.Load("MyPrefab", typeof(GameObject));
16.         GameObject go = Object.Instantiate(prefab);
17.         Entity e2 = go.GetComponent<GameObjectEntity>().Entity;
18.  
19.         // Step 2: Add MyComponent at some later time
20.         PostUpdateCommands.AddComponent(e2, new MyComponent());
21.  
22.         // Step 3: Try to iterate over existing objects with MyComponent for now
23.         for (int i = 0; i < myData.Length; i++) {          
24.             MyComponent myComp = myData.MyComponents[i]; // <- Deallocated
25.         }
26.  
27.     }
28.  
29. }

Is this a wrong usage of PostUpdateCommands, or just a limitation in the hybrid approach? Calling CreateEntity using PostUpdateCommands isn't possible with prefabs.

 

One way is to move prefab instantiation somewhere else like OnStartRunning so in OnUpdate it reinject again or you can call `UpdateInjectedComponentGroups()` after prefab instantiation to counter the create entity data invalidation inside GameObjectEntity's OnEnable.

 

Problem not in entity command buffer, problem in GO Instantiate, because GameObgectEntity added new entity in OnEnable than reallocated memory for chunks.

 

Ah, ahead of