Armor trim textures can no longer be overridden

• Short description of the issue

Using the armor_trims.json atlas, it was possible to point trims to use specific textures rather than applying a paletted permutation. Now that entity armor trim material textures are generated on-demand, the ability to override a trim material’s texture seems to be gone as well.

• Steps to reproduce the issue

1. Open Minecraft 26.2.

2. Create or open a world in creative mode or with cheats enabled.

3. Apply a Redstone trim of either Flow or Host onto any piece of armor.

4. Download and select the attached resource pack TrimOverrideExample.zip.

5. Repeat steps 2, 3 and 4 on a 26.3 snapshot version.

• Expected result

The Redstone Flow and Host trim textures would be customized via the resource pack to be a rainbow like on version 26.2.

• Actual result

The Redstone Flow and Host trim textures remain unchanged, and are still red using the redstone.png palette.

I’m hopeful that even if a fix isn’t made for 26.3 on short notice, a fix is at some point available in a future update like 26.4 or 27.1. I’ve been using this feature for a resource pack/datapack and I would be quite sad if it is no longer possible forever.