Rabbits spawned with spawnevent are scaled incorrectly

Rabbits spawned with spawnevent appear to be 1.8 rabbits, which are far larger than normal ones.

Steps to reproduce

1. Summon a rabbit with the following command: /summon rabbit ~ ~ ~ in_desert
2. Spawn a rabbit with a spawn egg
3. compare

Intended result: the sizes are the same

Observed result: the sizes are different