Any modifications made to items.json inside any custom behavior pack won't cause any effect on the game.
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@Mega_Spud sorry for taking too long. I attached an example behavior pack that is supposed to make Apples have tool rendering (hand_equipped) and make them raise the hunger by 10 half-drumsticks instead of the default of 4.
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I know you've reported it as a general bug, but could you please give an example of a change you'd make in the file, what you'd expect to happen, and what actually happens please?
An example behaviour pack is always appreciated too!