Describe the bug
I have custom models for skeleton, wither skeleton and piglin heads to match their custom models. But the inventory item models behaves strangely. When in your hotbar they will disappear if the item is visible in the creative tabs, and if you have them selected in your hotbar (when not looking at the inventory) they will become invisible. Also, sometimes the ears of the piglin head inventory model disappears for a few milliseconds when scrolling through creative tabs.

List and link to broken resourcepacks
https://drive.google.com/file/d/1cztu3pBhmGmRojt574luM5Gcm3NPacaG/view?usp=sharing

Expected behavior
The items should look like their in-world counterparts in the inventory.

Screenshots
https://imgur.com/a/0Gn0pXA

(please complete the following information):

• Minecraft Version: 1.20.1 (Quilt)
• EMF version: 1.3
• ETF version: 5.2.3 (don't think this is important)

Additional context
The piglin head looks vanilla because the custom piglin model doesn't change the vanilla head, only the body. But this change broke the in-world model of the head, so a custom head model recreating the vanilla head was made.