Pasted variable's default value is not preserved if you compile between undo and redo

If the user compiles the blueprint between undoing and redoing the pasting of a variable, the variable's default value is not retained.

1. Open QAGame in editor.
2. Create two actor blueprints (BP_A, BP_B)
3. Open BP_A.
4. Add a float variable and change the default value on it.
5. Compile.
6. Right-click the variable and select Copy.
7. Open BP_B.
8. Paste the variable.
9. Compile, not that the default value is preserved.
10. Undo the pasting
11. Compile again.
12. Redo
13. Compile again.

RESULT

The default value is lost.