Sulfur cube with wool is not light/beach ball

Short description:
Sulfur cubes fed with wool should act like beach ball or just have lower gravity and fly much higher when attacked.

Steps to reproduce:
1. Spawn sulfur cube;
2. Feed any wool type to sulfur cube;
3. Punch the sulfur cube.

Expected result: Sulfur cube have less gravity, flies more greatly and have less slow speed.
Actual result: Sulfur cube almost have the same parameters as having honeycomb inside.