Widgets remaining in memory after they are removed from viewport

Widgets appear to be remaining in memory even after they have been removed from viewport. A user can use Get all widgets of class to search for a widget (with Top level only set to false) and it will return valid when using an is valid check.

1. Open the editor
2. Create a new widget blueprint
3. Add a Text block to the designer tab (So that it can be seen)
4. Save and compile
5. Open the level blueprint
6. Create the blueprint in the attached image
7. Play in Editor
8. Press the 'F' key a few times
9. Notice the print string is returning that the widget is still valid

Expected: The is not valid would fire off and the print string "Gone" would show
Result: The Is Valid Check fires off it's Is Valid pin and the print string "Still here" is shown

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