Blueprint Actor with instance editable variables that are named with brackets cannot have their default values duplicated

When copying a Blueprint actor, Variables with brackets in their names don't have their values copied. IE: Creating a vector variable named "MyVector[]" This behavior also replicates with round brackets "()", square brackets "[]", and curly brackets "{}".

1. Open up Unreal Engine 4.20
2. Right click on Content folder-> Create new Blueprint Actor
3. Inside of Actor Blueprint, add a Vector variable and name it "MyVector[]" or "MyVector()"
4. Make the vector variable instance editable-> Compile & Save.
5. Add the Blueprint Actor to the world space
6. Edit the Blueprint Actor's MyVector[] variable to have a value.
7. Duplicate the actor (alt click, or duplicate)
8. Observe the new Actor's Vector Variable

Result: Vector variable values go back to defaults. (0,0,0)

Expected: Vector variable values copy onto the new Actor.