[BUG]Multi-texture items, like Spawn Eggs and Potions, tint incorrectly

[Cedric-Vii]

Describe the bug
Items that use multi-part textures, such as Potions and Spawn Eggs, seem to have tint colors applied to the whole item, rather than to the respective texture parts, when using a resource pack with grid colormap applied out of /assets/minecraft/optifine/colormap/custom/. Removing colormap from /custom/ fixes the issue, but then obviously no longer applies tint to blocks.

To Reproduce
Steps to reproduce the behavior:

1. Activate resource pack (example attached) containing a colormap (grass.png in example ashen_potion_test_broken) in the /custom/ folder.
2. Check Potion or Spawn Egg textures.
3. Textures should be incorrectly colored.

Expected behavior
Potions will have only the texture potion_overlay.png tinted, and Spawn eggs will have the textures spawn_egg_overlay.png and spawn_egg.png tinted separately when a grid-based colormap is present in /custom/.

Screenshots
Expected behavior:


Received behavior:

Desktop (please complete the following information):

• OS: Windows 10 Home
• Minecraft Version: 1.20.4
• Mod Version: 0.1.675

Additional context
Example packs attached below:
ashen_potion_test_broken.zip
ashen_potion_test_working.zip