Boats and items don't emit vibrations for dying by natural causes

Boats and items will emit vibration levels of 7 for getting damaged, but will never emit vibration levels of 15 for dying under natural circumstances. To reproduce, power the amethyst side of a calibrated sculk sensor fully, then destroy an item and a boat with burning/cactus damage. Notice that neither will produce "death" vibrations, despite doing so using the /kill command.