Video coming up.
Template
Here is the template:
The used resourcepack in the video:
Troubleshooting
Resource Pack Problems
-1.21.3
/give @p minecraft:carrot{CustomModelData:1234}1.21.4+
/give @p minecraft:carrot[minecraft:custom_model_data={floats:[1234]}] If it gives you a textured item, then the plugin probably doesn’t apply the custom model data. Check it in the following chapter.
Plugin Problems
Check if the plugin applied the custom model data:
/data get entity @p SelectedItemShould give:

Pay attention to everyhting behind floats! If you see no custom model data, then recheck your code for problems! Did you apply the meta again?
It still doens’t work!
That can happen! Installing resource packs is a tedious task. Fortunately, there are many AI models that know all the rules for creating resource packs/plugins. They can recognize problems immediately! I recommend using Claude, as he is the most up-to-date with Minecraft development. Also, don’t forget to mention your Minecraft version in the prompt!
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