Renaming a Blueprint variable loses override in grandchild Blueprint

Renaming a Blueprint variable loses override in grandchild Blueprint. Modifying and saving the BP_Child fixes the issue with BP_Grandchild losing overrides. 

1. Create a Blueprint hierarchy of BP_Parent->BP_Child->BP_Grandchild
2. Add a variable to BP_Parent
3. Restart editor
4. Override the inherited variable in BP_Grandchild
5. Rename the variable in BP_Parent
6. Restart editor
7. Open BP_Grandchild and notice that the variable override is reset to the default that is set in BP_Parent
8. Override the value again in BP_Grandchild and recompile twice
9. Notice that the override is reset to the default set in BP_Parent again

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