After increasing or decreasing the default mass value for an object within the Rigid body Tab of the Physics menu.

any changes to the objects scale using the + or - keys causes the default value for that object at that particular scale to be reapplied

Returning to the previous scale will also not bring back the lost mass value.

Shouldn't a scaling factor be applied to the entered mass when scales are changed in this situation increasing or decreasing the mass as appropriate.