[Bug]: Back Rendered Items not Syncing to Animation

[slave2midna]

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Minecraft Version

1.20.1

The Issue

This seems to have been an issue since 20.8 first launched, and I haven't been able to find a fix for it anywhere. It applies to ANY mod that renders a back item. The 3 I've tested with are:

Nyf's Quivers
Backpacked
YDM Weapon Master

In 20.7, these mods all sync'd properly with the Epic Fight animations - but after updating to 20.8 it has broken. I tested the mods with the 1.19.2 version of Epic Fight too, and the issue isn't present in those versions

Recording.2024-08-24.170803.mp4

I wanted to note that the items are visible! And they show up perfectly fine in the correct slots. They just don't sync with the animations.

I know there was some tools added to create datapacks or resource packs. Is it possible to fix these items with a resource pack or datapack?

Steps to Reproduce

Download any of the 3 mentioned mods from Curse, and Optionally Curios as it is a dependency for some of these mods. However, even without Curios, the YDM mod which only does the render without a slot.

Attempt to display and item on the back. It should show up perfectly fine.

Move around, and notice it doesn't sync with the animations.

[slave2midna]

Only appears to be effecting the Run animation. Combat animations and walk animation sync fine - and two-handed Greatsword animations work, but Longsword run animation doesn't.

[Forixaim]

Actually, to be honest it's all. The reason why you see it is because the change in back position is so subtle that you don't even notice.

There won't be a fix for YDM's weapon master since it is a closed source mod. Curios I believe probably needs a datapack I'm not sure.