Blutility Shelf tab not recognized on restart

Restarting the editor after docking a Blutility Shelf causes the tab to no longer be recognized.

Tested in 4.21.2 (CL - 4753647), 4.22 (CL - 5365847), 4.23 (CL - 4980862)

1. Open a Blank project
2. Enable Blutilities in Editor Preferences>Experimental>Editor Utility Blueprints
3. Open the Blutility Shelf tab by selecting Window>Blutility Shelf
4. Dock tab to the editor
5. Restart the project

Expected: The tab would have text asking for content

Result: The tab is not recognized