Axolotls float above the ground while walking or standing still

The bug

When they are on land, axolotls don't actually touch the ground, but float slightly.

How to reproduce

1. Summon an axolotl on land
2. Switch into spectator mode and look at the bottom of the axolotl

Observed behavior

The axolotl is not touching the ground; instead, it is floating slightly.

Expected behavior

The axolotl would be visually touching the ground when it is on the ground.