Add-on: Entity Variants Fail to Hold Items Correctly with Custom Geometry

When creating an add-on for Bedrock Edition, custom geometries for mob variants (such as different versions of Zombies) can cause held items to attach incorrectly. Specifically, if a new geometry file is used for a variant and the bone path differs from the default ("waist>body>rightArm>rightItem" for the right hand), items no longer attach properly to the "rightItem" bone. Instead, they appear to float in the air.

Details:

• I tested this with Zombie, Husk, Drowned, and Zombified Piglin, but the issue may extend to other mobs with variants.

• The issue occurs only with custom geometries and only for items held in the right hand.

• The problem does not arise when using default geometry or when modifying the bone path within the default geometry. Custom bones with altered pivot points in new geometries seem to trigger the bug.

Reproduction Steps:

1. Create a new geometry for any variant of a mob (e.g. Zombie) and reference it in the render controller.

2. Add a "rightItem" bone to the new geometry file, but use a custom bone path (e.g. if the default path is "root>body>rightArm>rightItem", change it to "waist>body>rightArm>rightItem" for baby).

3. Observe how the held item floats instead of attaching correctly to the right hand.

Expected Behavior:
Held items should attach to the "rightItem" bone regardless of whether the entity is using default or custom geometry, as long as the "rightItem" bone is present.

Attachments:

• Image showing the issue.

• Video showing the issue.

• Sample resource pack demonstrating the bug by changing the bone path as said in the example of reproduction step 2.