[1.20.1][Forge] Backpacked - Backpack(s) not rendering.

[JamZia]

Describe the bug

Backpacks seem to be working fine, they are craftable, you can equip them, and open them.
However, the backpack does not render on the player at all. And clicking the customize button inside of the backpack UI opens, but does not display any info about backpacks, and does not render anything,

To Reproduce

1. Equip backpack.
2. Open backpack.
3. click customize.

---

1. Equip backpack.
2. enter third person mode.

Expected behavior

The backpack should render properly.

Mod Version

3.0.0-beta.9

Minecraft Version

1.20.1

Modloader

Forge

Crash Log (if applicable)

No response

Additional context

No response

[JamZia]