Gameplay Debugger messages break after changing settings and restarting the editor

After restarting the editor, any changes to the Gameplay Debugger settings will break debugging when used again.

The user can work around this by changing the Gameplay Debugger settings again after the restart.

1. Open QAGame in editor.
2. Open the level QA-AI.
3. Open the Project Settings.
4. In the Gameplay Debugger section, under Add Ons, expand the Navmesh category.
5. Set Active in Game and Hidden to Enable.
6. Play in viewport.
7. Press Apostrophe. Note that Navmesh debugging is enabled by default.
8. Restart the editor.
9. Open QA-AI again.
10. Play in viewport.
11. Press Apostrophe.

RESULT

Navmesh debugging is missing, and is not listed at the top.

WORKAROUND

Change another Gameplay Debugger setting, and it'll start working again.