[MC-97481] dx, dy and dz (volume coordinates selection) doesn't work!

(Note that I know that dx, dy and dz are DIFFERENCES in x, y and z)

Selecting a box area using dx, dy and dz doesn't work.
when executing:

 /say @a[100,55,100,0,dx=10,dy=10,dz=10]

it will not work at all.

try using

 /say @a[100,55,100,3,dx=10,dy=10,dz=10]

confirms that it is a bug with dx,dy,dz, because getting in a 3 block range of 100,55,100 will trigger the command!