Slime and magma cube particles are too high

Steps to reproduce

1. Spawn magma cubes and slimes
2. Observe the particles they make when they land from each jump.

Expected result

The particles form/originate from where the slime/magma cube hits the ground.

Actual result

The particles form/originate from 1 block above the ground.
Particles in wrong place.mp4
Note that this is not as obvious for slimes because the slime particles fall to the ground after they form, but if you look closely you can see that they originate from 1 block up.