Draw Debug String doesn't render text outside of play

When calling the Draw Debug String node outside of play, no text is visible in the viewport. This occurs with Editor Callable functions on placed blueprints as well as from Editor Utility Widgets.

1. Create an Editor Utility Widget
2. Add a button to the widget
3. Hook up a Draw Debug String node to the OnClicked of the button
4. Set some text and duration for the node
5. Run the widget and click the button
6. No text shows up at the specified world location