The Add node does not update in the Construction Script

The Add node does not update in the Construction Script.

Reproduced in 4.7.1 binary and Main (//depot/UE4/Promotable-CL-2455917)

1. Open any project
2. Create a new Struct
3. Make the variable an Integer Array
4. Create a new Actor Blueprint
5. Make an array variable of the Integer Array Struct
6. Drag the variable into the Construction Script graph
7. Get (Split the output pin) MemberVar0 > Add
8. Add an integer value
9. Get the Length of the MemberVar0 array
10. Promote to variable and Set
11. Make the new integer variable Public so it can be seen in the Details panel in the level
12. Drop the BP into the level
13. Compile/Save All

Results:
The Details panel shows the value of the Public integer variable as 0, when it should be one. The same nodes placed in the Event Graph on Begin Play will work as expected.