A level will not save if a Blueprint that uses a Blueprint Component with an Event Dispatcher is placed in it

A level will not save if a Blueprint that uses a Blueprint Component with an Event Dispatcher is placed in it.

Reproduced in 4.7.2 binary. Could not test in Main due to [Link Removed]

1. Open any project
2. Create a new Character Blueprint
3. Add New Blueprint Script Component > Actor Component
4. Add an Event Dispatcher to the BP Component
5. Place the Character BP in the level
6. Save

Result:

Can't save D:/4.7_Projects/BugTests/Content/Maps/Example_Map.umap: Graph is linked to private object(s) in an external package.
External Object(s):
HealthComponent2_0

Fix UE-51650

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