Spell of Growth / Decay uses wrong reference point

[riddle]

It is like this:

Works in a 32 by 32 by 32 cube (you are in the middle).

It should be like this:

Works in a 32 by 32 by 32 cube (you are in the middle on its bottom).

Visual representation. It is like this:

It should be like this:

[riddle]

Screenshots not to scale.

[matejdro]

Hm, player location is one block above ground (as you positioned your glowstone on the bottom image), which means grass decaying won't work unless player buries himself into the ground.

Should I move "the box" one block below player?

[riddle]

Oh. Yes, it makes sense!

[matejdro]

Should I also do that to growth spell for consistency?

[riddle]

yea