"Found more than one function with the same name" after duplicating an interface function

REGRESSION: No, this occurs as far back as 4.20

After duplicating a blueprint interface function, the duplicate interface will have an error similar to this:

LogBlueprint: Error: [Compiler NewInterface] Found more than one function with the same name NewFunction_0; second occurance at  Test

1. Open QAGame in editor.
2. Create and open a new blueprint interface
3. Select the existing interface function and press Ctrl+W.
4. Rename the new interface and compile.

RESULT

The blueprint will have an error