when trying to use MatchItems
you are not able to use it on all items, I have tried using my model on a netherite_sword and it worked perfectly, but when i switched the item to be one of these (there probably are more) amethyst_shard, small_amethyst_bud, echo_shard it just returned back to the minecraft texture.
I am using the 1.1.5 version of the mod (1.20.4) if that is relevant.
Here are the files i used to test
test.zip

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