Lightmaps still showing up after deleting

One of the issues with Light mass (seems like a bug) is that even after you delete the Lightmaps they still show up under World Settings >Lightmass.

And vice versa.
When using GPU Lightmass and doing a bake i sometimes do NOT see them uner World Settings > Lightmass.

Relaunching the project confirms this.

Has anyone experienced this?