BUG: media used in Fusion Tab - usage not managed correctly

If a picture or footage clip is used in a fusion composition as Media In, the usage in the media pool is counted up which is correct, but it is not counted down when the Media In node or the whole Fusion Comp is deleted.
This leaves media classified as used wich are not used any longer.
This is a BUG
This leaves media classified as used wich are not used any longer.
This is a BUG