PostProcessVolume Actor doesn't appear in PIE Outliner

1. Download the attached repro, open
2. Observe that there is a Post-Process Volume, and it is in a Data Layer in the starting
   map. It is the only thing in the Data Layer.
3. Play PIE. Observe that the Post-Process Volume disappears from the Outliner, but still
   exists in the world. Entering it with the camera has a visible difference from its
   post-processing material

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