Deleting value in Transform editor of Configuration deletes joint mapping, when only value should be deleted.

repro:
-enter the Configuration of any Humanoid
-select the Hips joint in the Mapping list (Inspector)
-select the Position X (or any other) value in the Transform editor (bottom of the Inspector)
-hit "backspace" on the keyboard to clear the numerical value...
bug: Hips joint is no longer mapped in the list.
expected result: Only the numerical value is delete (Hips is still mapped in the list)