Copying an instance of a blueprint actor that has an extra, non-default element in an array does not copy that extra element

Copying a blueprint instance that has an array does not copy any elements added to that array directly on the instance and only copies the blueprint's default array elements

This worked in 4.13 and, according to the licensee who reported this, was possibly broken somewhere in or prior to 4.17

Regression?: No
This occurred in 4.18

1. Create a new project
2. Add a new Blueprint based off of Actor
3. Add a variable, make it an array of Transforms
4. Add a few elements to the array and make the variable Editable
5. Compile/save the blueprint
6. Add an instance of the blueprint to the level
7. Add a new element to the array
8. Copy the blueprint
9. Paste the blueprint
10. Check the array on the new copy
    Result: The copy only has the original elements of the array and does not have the one added to the instance.
    Expected: The copy is an exact copy of the instance, with the same array elements.