Performing a mace smash attack on a copper golem searching a chest makes the wrong sound

If you perform a mace smash attack on a copper golem while it is looking in a chest, the mace will make the sound item.mace.smash_air, as if the copper golem is in the air while looking in the chest.

Steps to reproduce:

1. build a copper golem (including chest)

2. build a 10 block tall tower nearby and stand on it

3. fall from the tower while the golem is searching the chest and use the mace on the golem.

4. observe the sound the mace makes

Expected result:

The mace would make the sound item.mace.smash_ground_heavy for a powerful smash on a mob which is on the ground.

Observed result:

The mace makes the sound item.mace.smash_air, which is normally played if the smashed mob is in air (in this case, the golem is on the ground).

Note:

To better understand the difference, you can try doing the same steps, but use the mace while the golem is not searching the chest. The mace will produce the correct sound.