New folders don't show up in World Outliner when "Only in Current Level" is set

When Only in Current Level is set in the World Outliner, any new folder will be hidden by default since there are no assets from the level in the new folder. This make it seem that the folder wasn't actually created.

Regression:
No - same behavior occurs in 4.16.3 (CL 3561208)

1. Open UE4 Editor (any project)
2. In the World Outliner, click View Options -> Only in Current Level
3. Add a new folder to World Outliner by clicking the folder button next to the search bar

Result:
The new folder immediately hides itself after creation

Expected:
New folder remains visible to allow for organization