A Blueprint containing a child actor component containing another Blueprint that derives from NavLinkProxy does not provide a nav path when a project is opened until paths are rebuilt

If a Blueprint is derived from NavLinkProxy, and then that Blueprint is added to another Blueprint as a ChildActorComponent, the second Blueprint's Smart Link functionality will not work when the project is opened in the Editor until the nav paths are rebuilt. Nav paths have to be rebuilt every time the Editor is opened.

EDIT: I was unable to test this in 4.8 or Main because the included SmartLinkComponent does not appear to be creating the Box Obstacle it was asked to create (reported in [Link Removed]).

1. Download the attached project.
2. Associate the project with a 4.7 version of the Engine.
3. Open the project in the Editor.
4. Start Simulate.
   • Note that a nav path is drawn, starting on the right side, past the first obstacle, but not past the second obstacle. See NotWorking.png
5. Click the Build button.
6. Once the build is complete, start Simulate.
   • Note that a nav path is now drawn, starting on the right side, past both obstacles. See Working.png
7. Close the Editor.
8. Re-open the project in the Editor.
9. Start Simulate.

RESULT:
The nav path past the second obstacle is no longer drawn.

EXPECTED:
A nav path past both obstacles is still drawn.

Fix UE-51650

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