Instanced UObject property in custom code Component class resets to default value when project is closed and re-opened in the Editor

When an instanced UObject property is added to a custom code Component class, changing the value of the property in a Blueprint that includes the custom Component only lasts until the Editor is closed. When the project is opened again in the Editor, the value of the property has reverted back to its default value.

This only happens if a default subobject is created for the instanced object property in the custom code Component class' constructor.

1. Download the attached project (created in Main at CL 4670176).
2. Associate the project with your version of Main.
3. Build the project in Visual Studio.
4. Open the project in the Editor.
5. Open the BP_Actor Blueprint.
6. Select the MyActor component.
7. In the Details panel, change the Instanced Object Rep property from "My Instanced Object" to "BP Instanced Object."
8. Compile and save the Blueprint.
9. Close the Editor.
10. Open the project in the Editor again.
11. Open the BP_Actor Blueprint.
12. Select the MyActor component.

RESULT:
The Instanced Object Rep property has reverted back to "My Instanced Object."

EXPECTED:
The Instanced Object Rep property is still set to "BP Instanced Object."

WORKAROUND:
Do not create a default subobject for the instanced object property.