so my sweet lil serval texture only works with the nametag 'azure' instead of 'Azure'
Shadow said to make a note here about it lol

Confirming Shadow said that.

Mind you I'm on the 1.16.5 version if that makes a difference*

https://github.com/TeamMetallurgy/Atum2/blob/master/src/main/java/com/teammetallurgy/atum/client/render/entity/mobs/ServalRenderer.java

line 31 here is the culprit

if (entity.hasCustomName() && entity.getCustomName().getString().equals("azure")) {

Fixed :)
Also added Azu and Azuriuz as alternate names.