Armors textures not working with shaders mod

Armors textures look broken when using custom shaders mods (1.17+)

If you are on 1.21.2 and greater (both server and clients) you can use the new armors creation method that doesn't use any vanilla shader to create custom armors, so it is compatible with the shaders mods.

More info here.

What was the cause of this bug?

Optifine issue

Optifine has a limitation which doesn't allow custom armors to work correctly if you have any custom Optifine shaders installed.

You have to disable the Optifine shaders temporarily or temporarily live with the issue.

I already contacted Optifine developer about this: https://github.com/sp614x/optifine/issues/6391

Iris Shaders issue

Iris has a limitation which doesn't allow custom armors to work correctly if you have any custom Iris custom shader installed.

I already contacted Iris developers about this: https://github.com/IrisShaders/Iris/issues/1042