Unable to edit default values of TMap struct variable stored in an inherited component from the full blueprint editor

When you have a struct variable that is part of a TMap which is stored in an inherited component, the struct is not editable in the full blueprint editor. It is editable in the data only blueprint editor however.

Regression?: No
This also occurred in 4.15

Branches tested:
4.15.3-3450819+++UE4+Release-4.15
4.16.1-3466753+++UE4+Release-4.16
4.17.0-3515847+++UE4+Dev-Main

1. Download the attached project, unzip, generate project files, compile, and open the project
2. Open NewBlueprint (Which should open in the Data-Only blueprint view)
3. Add an element to the "Test TMap" TMap
4. Expand the element to see that InnerVar is editable
5. Click "Open Full Blueprint Editor"
6. Expand the same element in the TMap
   Result: InnerVar is not editable in the full blueprint editor
   Expected: InnerVar is editable as it is in the data only blueprint editor