Instance added Child Actors are not initialized when using world partition

A Child actor spawned via a Child Actor Component that is added to an actor instance using the Subobject Editor is not initialized when using world partition. The spawned child actor is not present the level's actor list during ULevel::RouteActorInitialize.

• Create a level using world partition
• Add an actor to the level
• Select the actor and click the Add button in the DetailsPanel->Subobject Editor panel
• Add a Child Actor Component and set the Child Actor Class property in the details panel
• PIE
• Note that the child actor is valid, but it is not initialized(bActorInitialized=false), does not render, and isn't visible in the scene outliner.