It relates to CL 4433780.

Steps to Reproduce
  1. Create a new map.
  2. Create another new map as sublevel and add some static meshes in the sublevel.
  3. Click "Build" or "Build Geometry" from the Editor Tool Bar.
  4. Save all maps.
  5. Reload the main map.

The sub level is not loaded correctly.

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ComponentTools - World Composition
Affects Versions4.21.2
Target Fix4.23
Fix Commit6339960
Main Commit6838042
CreatedMar 28, 2019
ResolvedMay 7, 2019
UpdatedSep 24, 2019