When opening a level that contains actors with a childActor component, "LogSpawn:Warning: UWorld::DestroyActor: World has no context!" warning will be displayed for each actor.
1. Open the attached project
2. Open NewMap(ParentActor has a childActor component that calls a simple BP actor with a cube)
3. Look at the output log which shows warnings like the following:
LogSpawn:Warning: UWorld::DestroyActor: World has no context! World: NewMap, Actor: /Game/NewMap.NewMap:PersistentLevel.DESTROYED_Actor1_C_CHILDACTOR_128
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-42679 in the post.