Blueprints with inherited Macros cannot save

Blueprints with inherited Macros cannot save.

Reproduced in 4.7.1 binary and Main (//depot/UE4/Promotable-CL-2455917)

1. Open any project
2. Create a new Actor Blueprint
3. Create a new Macro
4. In the Content Browser, right-click the BP and create a child BP
5. In the child BP's Event Graph, right-click and search for the Macro
6. Compile
7. Save

Results:
"Can't save D:/4.7_Projects/BugTests/Content/Blueprints/ActorMacroBP_Child.uasset: Graph is linked to private object(s) in an external package.
External Object(s):
NewMacro_0

Try to find the chain of references to that object (may take some time)?"

Clicking OK fails to save the BP.