(1.3b2) More than one Bolt.SceneVariables singleton (NOT due to import)

When doing regular work in 1.3b2, I got the following error:

There was only one Scene Variables component present in the scene (I ran a search), and only one scene loaded.  It persisted through restarting Unity.  To eliminate it, I removed the Scene Variables component, let Bolt make a new object with the Scene Variables component and copied the values of the Variables component to the new instance.  Then removed the old instance.  This fixed the error.

I do not know the ultimate cause, as it just appeared and I've only gotten it once.