Hello,
I use all three stardust packs (Terralith, Incendium, and Nullscape).
This issue is specific to Incendium and the custom shields offered.
We have a multiplayer server on version 1.21.11 running Paper.
Our issue is that when viewing any shields in an inventory GUI or equipping them in either the hotbar or offhand, there is no texture whatsoever. Just the classic purple and black 3D blob.
We have the texture pack paired up with ItemsAdder, so that could cause a conflict.
I will follow up with images shortly. Any feedback or tricks from the past would be appreciated!