Object references do not save for local variables within a function library when set as a default

As an example, if a user sets a material variable's default within a function library it will not save. The Variable will be set back to "None" after hitting the compile button.

1. Open the editor
2. Create a new Function library
3. Add a new local variable
4. Change the variable type to Material
5. Set the default value to "Cube Material"
6. Hit the compile button
7. Notice that the Material default has been set back to "None"

Expected: The Default value would remain after hitting the compile button
Result: The Default value is removed