Bug Broken baker with entities 1.0 when using 2 string fields in a class Component

Use case

I have :

• A baker creating a Map
• A baker creating an additionnal entity referencing the Map (PrimaryEntity)
• This additionnal entity have string metadata to load the map

Issue

At first, when I was using a single string metadata in my IComponentData, everything as fine, in the system the reference to the Entity is working as expected:



BUT after I added a second string to a class IComponentData, at runtime, the entity referenced is completly messed up, is this exemple the entity is a System instance AND NOT the Cube entity:



(screen shots based on code below):


How to reproduce

• Create a new scene with an empty subscene
• Add a new Cube to the subscene
  
• Add the DebugWrongEntityAuthoringComponent component to the cube

Code (CSharp):

1.  
2. using Unity.Entities;
3. using UnityEngine;
4.  
5. [DisallowMultipleComponent]
6. public class DebugWrongEntityAuthoringComponent : MonoBehaviour
7. {
8.     public class Baker : Baker<DebugWrongEntityAuthoringComponent>
9.     {
10.         public override void Bake(DebugWrongEntityAuthoringComponent authoring)
11.         {
12.             AddBuffer<MapData>();
13.             var mapEntity = GetEntity();
14.  
15.             var extraWorkingEntity = CreateAdditionalEntity();
16.             AddComponentObject(extraWorkingEntity, new LoadMyMapWorking { MyMap = mapEntity });
17.  
18.             var extraBuggyEntity = CreateAdditionalEntity();
19.             AddComponentObject(extraBuggyEntity, new LoadMyMapBuggy { MyMap = mapEntity });
20.         }
21.     }
22. }
23.  
24. public struct MapData : IBufferElementData
25. {
26.     public int DummyData;
27. }
28.  
29. public class LoadMyMapWorking : IComponentData
30. {
31.     public Entity MyMap;
32.     public string StringData1;
33. }
34.  
35. public class LoadMyMapBuggy : IComponentData
36. {
37.     public Entity MyMap;
38.     public string StringData1;
39.     public string StringData2;
40. }
41.  
42. [RequireMatchingQueriesForUpdate]
43. public partial class LoadMyMapSystem : SystemBase
44. {
45.     protected override void OnUpdate()
46.     {
47.         var ecb = this.GetSingleton<EndSimulationEntityCommandBufferSystem.Singleton>().CreateCommandBuffer(World.Unmanaged);
48.         var getBuffer = GetBufferLookup<MapData>(isReadOnly: false);
49.  
50.         Entities
51.              .WithoutBurst()
52.              .ForEach((LoadMyMapWorking loadMyMap, in Entity loadEntity) =>
53.              {
54.                  ecb.DestroyEntity(loadEntity);
55.                  var myData = getBuffer[loadMyMap.MyMap];
56.                  myData.Add(new MapData());
57.                  Debug.Log("LoadMyMapWorking.MyMap is working as expected");
58.              })
59.              .Run();
60.  
61.         Entities
62.              .WithoutBurst()
63.              .ForEach((LoadMyMapBuggy loadMyMap, in Entity loadEntity) =>
64.              {
65.                  ecb.DestroyEntity(loadEntity);
66.                  try
67.                  {
68.                      var myData = getBuffer[loadMyMap.MyMap];
69.                      myData.Add(new MapData());
70.                  }
71.                  catch (System.Exception e)
72.                  {
73.                      // Oopsy!! :
74.                      // A component with type:MapData[Buffer] has not been added to the entity.Entities Journaling may be able to help determine more information.
75.                      // Please enable Entities Journaling for a more helpful error message.
76.                      Debug.LogError("LoadMyMapBuggy.MyMap is NOT working as expected: ");
77.                      Debug.LogError(e.Message);
78.                  }
79.              })
80.              .Run();
81.     }
82. }

Context

Unity Version:
2022.2.0b14.112.4874

Packages versions

 

Thank you, I confirm the workaround works!