Invalidation box appears inconsistent when using child widgets

Invalidation box appears to be inconstant when using a child widget that has been added via the user created section. A child widget that modifies itself will not update when placed inside of an invalidation box within a parent widget. However, if the widgets within the child widget are called within the graph of the parent, the child widget will update without being invalidated first.

1. Download the attached project
2. Open the project
3. Open Untitled level
4. Play in Editor (the text widget shown will not update)
5. Stop PIE
6. Open "childwidget"
7. Disconnect the tick event
8. Save and compile
9. Open "InvalidBox" widget
10. Connect the tick event
11. Play in Editor

Result: The Text is now updating with a random number
Expected: The text would not update until the widget has been invalidated