Key frames from widget animations are not removed from the timeline when a widget is deleted

If the user creates a widget and adds an animation for this widget and then deletes the widget the key frames will not be removed from the animation timeline.

1. Download attached project
2. Open project
3. Open "AlphaDragTest"
4. Delete the button
5. Notice the key frames at the bottom are not removed

Deleting UMG widget animations and re-adding

Deleting UMG widget animations and re-adding