Issue Description:

Note: If this bug occurs in a modpack, please report this to the modpack author. Otherwise, delete this line and add your description here. If this is a feature request, this template does not apply to you. Just delete everything.

Steps to reproduce (important):

1. Go into Nether
2. Chickens that spawn there die shortly after they step into fire or lava

What happens:

Provided above

What you expected to happen:

Nether chickens, or fire chickens(Blaze, lava, obsidian...) should immuned to fire damage

Affected Versions (Do not use "latest"):

-Chickens: beta 6.1.0
-Minecraft: 1.12.2
-Forge: 14.23.4.2760

it was actually set up in the code for that.. but the part to actually make it immune wasn't there. So it will get patch. but I am make a big change to the spawning rules. So the update will be a while.