Double resolution texture makes item too big only when in player's hand

Question

In my resource pack, most of the textures are the default resolution (16x16) but two item textures are 32x32 instead. These mostly display correctly, except when held in the player's hand. Then, the higher resolution items appear too big. In the inventory/Creative menu, and when dropped on the ground, the items are all the correct size, regardless of texture resolution.

Here is an example of the double resolution item (the squid tentacle) on the ground beside two standard resolution items:

And here is the player holding a 32x item (the same squid tentacle) and a 16x item (the fish):

Is there a way to scale down the higher resolution item's size when in the player's hand, so that it matches the other items?

---

This is the image I'm using for the item texture:

And here is squid.item.json from the behavior pack:

{  
  "format_version": "1.20.30",  
  "minecraft:item": {  
        "description": {  
            "identifier": "addtns:squid",  
            "menu_category": {  
                "group": "itemGroup.name.rawFood",
                "category": "nature"
            }  
        },  
        "components": {
            "minecraft:hand_equipped": false,
            "minecraft:max_stack_size": 64,
            "minecraft:icon": {  
                "texture": "squid"  
            },  
            "minecraft:display_name": {  
                "value": "Squid"  
            },
            "minecraft:use_duration": 2,
            "minecraft:use_animation": "eat",
            "minecraft:food": {
                "nutrition": 3,
                "saturation_modifier": 0.4,
                "can_always_eat": false
            }
        }
    }
}

Answer 1

As is discussed in this article which was recently contributed to the Bedrock Wiki by user BlazeDrake, it is necessary to use something called an attachable along with items having texture resolutions other than 16x16 (at least for Minecraft Bedrock Edition texture packs).

Quoting from the article:

You may have noticed an issue with higher resolution items though: They end up looking larger rather than more detailed!
...
The solution to this is using an attachable to scale the item down while being held. ...[I]t will look very similar to a normal item, save for some slight differences in rotation and in how it animates when you punch with it. The main idea of what it does is that it uses an animation to scale the size of the item down to what the size should be[.]

The linked page also provides a template for the 3 required resource pack files: attachable, render controller, and animation.