Child actor components get duplicated when duplicating a level (extra duplicates)

Child actor components get duplicated when duplicating a level (extra duplicates). The duplicate level has more instances of the child actor component than the original

1. Open the editor
2. Create a new actor blueprint
3. Name it ParentTest
4. Create a new actor blueprint
5. Name it ChildTest
6. Add a static mesh to Child test
7. Save and compile
8. Add a child actor to ParentTest and set it to ChildTest
9. Save and compile
10. Add ParentTest to the level
11. Save
12. Duplicate the level
13. Open the duplicated level
14. Click and drag on the static mesh component
15. Notice that the child actor has been duplicated and that there are new two instances of the child actor component

Expected: The level would be an exact duplicate
Result: The duplicate level has more instances of the child actor component than the original

Fix UE-51650

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