Bug pre.47: Exceptions in inspector with ghost components

Since updating to pre.47, I'm seeing exceptions in the inspector when viewing gameobjects with ghost components. Note that everything still appears to work correctly at runtime.

Opening an existing prefab with GhostAuthoringComponent and GhostAuthoringInspectionComponent shows this error:

Code (CSharp):

1. InvalidOperationException: The BlobAssetReference is null.
2. Unity.Entities.BlobAssetReferenceData.ValidateNotNull () (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/Blobs.cs:281)
3. Unity.Entities.BlobAssetReference`1[T].get_Value () (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/Blobs.cs:442)
4. Unity.NetCode.Editor.EntityPrefabComponentsPreview.AddToComponentList (Unity.NetCode.Editor.BakedEntityResult parent, System.Collections.Generic.List`1[T] newComponents, Unity.NetCode.GhostComponentSerializerCollectionData collectionData, Unity.Entities.World world, Unity.Entities.Entity convertedEntity, System.Int32 entityIndex, Unity.Entities.BlobAssetReference`1[T] blobAssetReference) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/EntityPrefabComponentsPreview.cs:177)
5. Unity.NetCode.Editor.EntityPrefabComponentsPreview.CreateBakedEntityResult (Unity.NetCode.Editor.BakedGameObjectResult parent, System.Int32 entityIndex, Unity.Entities.World world, Unity.Entities.Entity convertedEntity, System.Boolean isLinkedEntity, Unity.Entities.BlobAssetReference`1[T] blobAssetReference) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/EntityPrefabComponentsPreview.cs:135)
6. Unity.NetCode.Editor.EntityPrefabComponentsPreview.CreatedBakedResultForPrimaryEntities (Unity.Entities.World world, System.Collections.Generic.Dictionary`2[TKey,TValue] bakedDataMap, Unity.NetCode.GhostAuthoringComponent authoringComponent, Unity.Entities.BakingSystem bakingSystem, System.Collections.Generic.HashSet`1[T] primaryEntitiesMap, Unity.Entities.BlobAssetReference`1[T] blobAssetReference) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/EntityPrefabComponentsPreview.cs:81)
7. Unity.NetCode.Editor.EntityPrefabComponentsPreview.BakeEntireNetcodePrefab (Unity.NetCode.GhostAuthoringComponent authoringComponent, System.Collections.Generic.Dictionary`2[TKey,TValue] bakedDataMap) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/EntityPrefabComponentsPreview.cs:50)
8. Unity.NetCode.Editor.GhostAuthoringComponentEditor.BakeNetCodePrefab (Unity.NetCode.GhostAuthoringComponent ghostAuthoring) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/GhostAuthoringComponentEditor.cs:164)
9. Unity.NetCode.Editor.GhostAuthoringInspectionComponentEditor.OnUpdate () (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/GhostAuthoringInspectionComponentEditor.cs:67)
10. UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at <1ef2856add15407ab99fef0e978737e3>:0)

And making a new gameobject with both components directly in a scene shows this error:

Code (CSharp):

1. ArgumentException: A component with type:Unity.NetCode.GhostPrefabMetaDataComponent has not been added to the entity. Entities Journaling may be able to help determine more information. Please enable Entities Journaling for a more helpful error message.
2. Unity.Entities.EntityComponentStore.AssertEntityHasComponent (Unity.Entities.Entity entity, Unity.Entities.ComponentType componentType) (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/EntityComponentStoreDebug.cs:302)
3. Unity.Entities.EntityComponentStore.AssertEntityHasComponent (Unity.Entities.Entity entity, Unity.Entities.TypeIndex componentTypeIndex) (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/EntityComponentStoreDebug.cs:324)
4. Unity.Entities.EntityDataAccess.GetComponentData[T] (Unity.Entities.Entity entity) (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/EntityDataAccess.cs:1278)
5. Unity.Entities.EntityManager.GetComponentData[T] (Unity.Entities.Entity entity) (at ./Library/PackageCache/com.unity.entities@1.0.0-pre.47/Unity.Entities/EntityManager.cs:364)
6. Unity.NetCode.Editor.EntityPrefabComponentsPreview.BakeEntireNetcodePrefab (Unity.NetCode.GhostAuthoringComponent authoringComponent, System.Collections.Generic.Dictionary`2[TKey,TValue] bakedDataMap) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/EntityPrefabComponentsPreview.cs:48)
7. Unity.NetCode.Editor.GhostAuthoringComponentEditor.BakeNetCodePrefab (Unity.NetCode.GhostAuthoringComponent ghostAuthoring) (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/GhostAuthoringComponentEditor.cs:164)
8. Unity.NetCode.Editor.GhostAuthoringInspectionComponentEditor.OnUpdate () (at ./Library/PackageCache/com.unity.netcode@1.0.0-pre.47/Editor/Authoring/GhostAuthoringInspectionComponentEditor.cs:67)
9. UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at <1ef2856add15407ab99fef0e978737e3>:0)

 

Yup, removing GhostAuthoringInspectionComponent stops the BlobAsset exception. You can reproduce this in the same project with any of the prefabs inside the _Prefabs folder.

 

So I rolled back my project to test on pre.15 for another issue, returned to pre.47, and now the GhostAuthoringInspectionComponent works.

The exception was occurring even after multiple editor restarts, but before going from .15 to .47 the second time I wiped the library, which maybe resolved it?