Trigger Volume bounds do not appear for custom Trigger Volume class until editor is restarted

After creating a class based on Trigger Volume, adding an instance of the custom class to the viewport does not show the green bounds of the volume until after the editor is closed and restarted. This prevents the volume from being interacted with if added to the viewport before the restart (events won't trigger).

1. Open UE4 Editor
2. Add code to project based on Trigger Volume (MyVolume)
3. In modes tab, type "My" to find MyVolume
4. Add instance of MyVolume to the level

Result:
The volume shows up in the world outliner but the bounds are not visible and the volume cannot be interacted with.

Expected:
Volume is added and visible and can be interacted with after creating the new class.