Set variables based on Enumeration do not update when the number of members changes

Set variables based on Enumeration do not update when the number of members changes. The drop down menu will update if Refresh all nodes is used or if the user restarts the project.

1. Open the editor
2. Create a Enumeration
3. Add one member to the enum list
4. Save
5. Create new actor blueprint
6. Add a variable of the type of the enum that was created above
7. Drag out a set variable of the enum
8. Compile and save
9. Open the enumeration blueprint
10. Add new members
11. Save
12. Open the actor blueprint with the enum
13. Click the drop down for the set

Result: The new enumeration members do not show up in the list
Expected: The drop down menu for the set variable would update when the Enumeration is updated