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[ECS][DOTS] Entity Conversion interface does not work in Sub-Scenes

Package: Entity Component System (ECS)


Reproduction steps:
1. Open "1187223" project
2. Enter Play mode
3. Notice in the "Entity Debugger" window that there are 3 different Entity Objects

Expected Result: There should be 4 different Entity objects, one created by a Sub-Scene
Actual Result: Entity Conversion interface does not work in Sub-Scenes

Reproduced with: 2020.1.0a12, 2019.3.0b10, 2019.2.12f1, 2018.4.12f1
Did not reproduce on: 2017.4.34f1

  1. Resolution Note:

    When a game object is converted inside of a subscene, only entities created with GameObjectConversionSystem.CreateAdditionalEntity(GameObject) will be persisted in the subscene. This specifically means that entities created using calls to dstManager.CreateEntity() will not appear after conversion. More recent versions of entities actually warn if there are any such orphaned entities at the end of conversion.

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