Dying to a sulfur cube doesn't increase the player's `killed_by:sulfur_cube` statistic

A player dying to a mob will normally increment the “killed_by” statistic and the death message “Player was blown up by Sulfur Cube” shows that it should increment for the Sulfur Cube but it doesn’t.

Steps to Reproduce:
1) Place a TNT block in the sulfur cube
2) Ignite the sulfur cube with a flint and steel and stand next to it in survival
3) After respawning, check the statistics to observer there is no increase