Rabbits Spawned with Spawn Event String Are About 2x Normal Size

Summoning a rabbit with the spawnEvent field filled will summon a massive rabbit.

What I expected to happen was...:
Rabbit should be spawned with normal size or the command should fail.

What actually happened was...:
A rabbit ~2x the size of a normal rabbit was spawned.

Steps to Reproduce:

1. Load up a world with commands enabled
2. Use command

   /summon rabbit ~~~ gesulgkjwga Toast
   

3. Observe Rabbit that has consumed popeyes spinach