I was trying to make a custom mob in vanilla minecraft, but when I tried to give an Elder Guardian custom health, it had the same health that it always does.

What I expected to happen was...:
The Guardian would have 225 health, like I specified.

What actually happened was...:
The Guardian has its normal amount of health.

Steps to Reproduce:
1. Open a new world and get a command block.
2. Enter this command: /summon Guardian ~ ~1 ~ {Elder:1,Attributes:[

{Name:generic.maxHealth,Base:225.0}

]}
3. Activate the command block. It should summon a normal Elder Guardian, when it's supposed to summon one with 225 health.

I don't know if I'm just doing something wrong or if this is a bug, but I decided to report it just in case.