Fast preview appears to export the first scene alphabetically, rather than the active scene.

With blend4web 16.9.2, the scene used for "fast preview" appears to be chosen based on the scene's name. E.g, a scene named with "A" will always be previewed, even if the current scene in blender is a different scene called "B".

IMO this is pretty unintuitive. I expected it to use the currently active scene (bpy.context.scene). If it's important to be able to have fast preview consistently pick a specific scene, then I'd vote for having a separate option, something like "preview scene".