Using a mace's smash attack on a shulker always plays the item.mace.smash_air sound effect

Steps to reproduce:

• Spawn a shulker on the floor

• Hold a Mace

• Hit the shulker while you're falling from 1.5 blocks or higher

Expected result:

• The sound played should be either item.mace.smash_ground or item.mace.smash_ground_heavy depending on the distance fallen

Observed result:

• The sound item.mace.smash_air plays instead, despite the shulker not being in the air.