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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

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.

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.