BP child not overriding parent's mesh in Nativized builds

The mesh on the right is a child of the one on the left, in a non-nativized cooked build it's a sphere, but in a nativized one, it's a cube.

Regression:
Working: UE4/Main, 4.15 CL 3233043
Broken: UE4/Release-4.15 CL 3244817

1. Open QAGame in UE4Editor
2. Navigate to: Edit > Project Settings > Packaging
3. Make writeable if necessary
   1. Expand advanced arrow under "Packaging" header
   2. Add the following to "List of Maps to include in a packaged build":

      QA-Blueprints
      /Game/Maps/Blueprints/QA-Blueprints
      

4. Still in packaging settings, under Blueprints, change the Blueprint Nativization Method to Exclusive
5. Open Blueprint'/Game/Blueprints/Test-Parent.Test-Parent' and enable Nativize option
6. Make sure, that Nativize is disabled in Blueprint'/Game/Blueprints/Test-InheritParent.Test-InheritParent'
7. Navigate to: File > Package Project > Windows > Win64
8. Run the package.
9. Hit ~ and type: "open QA-Blueprints"
10. Turn to your right and view example 5.1

Result:
Mesh on the right is a cube

Expected Result:
Mesh on the right is a sphere.