When a mule spawn egg is used on a mule to spawn a baby mule, or when a baby mule is spawned using commands, it is missing its max_health, follow_range and jump_strength attributes, and its health value is equal to 53 (just like before MC-178383 was fixed).

Horses and donkeys don't have the same problem.

How to reproduce:

1. Spawn a mule and use a spawn egg on it to spawn a baby mule, or execute the following command:

   /summon minecraft:mule ~ ~ ~ {Age:-32767}

2. Making sure the baby mule is the closest one to you, execute the following command:

   /data get entity @n[type=minecraft:mule] attributes

Expected result:

A baby mule spawned by using a spawn egg or commands would have all of its attributes.

Observed result:

A baby mule spawned by using a spawn egg or commands is missing its max_health, follow_range and jump_strength attributes.