Dismounting a horse/mule/strider clips you 1 block into the ground when using touch controls

Steps to reproduce:

1. Create/open a superflat world
2. Spawn a horse/mule/strider
3. Ride it
4. Dismount it

Observed result:
You sink 1 block into the ground.

Expected result:
You land on surface level when dismounting.

Notes:
I could not reproduce this on Windows with keyboard & mouse controls, nor could I reproduce this on the latest stable release.