Leading and removing lead from mobs with custom variants based on NBT caused insane lag and spams the log with errors.

Video
https://www.youtube.com/watch?v=sl7IM9s2R40
In the video you can see me leashing and unleashing the sheep, the texture breaks and causes a ton of lag, releashing fixes the texture and stops the lag.

Crash log
No crash but log was spammed with this error
[Render thread/ERROR]: [ETF]: nbt test crashed reading entity NBT.
Log: https://mclo.gs/AxfVXIQ

Your setup: (please complete the following information):

• Minecraft version: 1.21.5
• ModLoader: Fabric
• ETF Version: 6.2.13
• Does the issue persist with only ETF installed? yes
• Have you checked the FAQ in the Readme, or Discord, to see if it is a known issue? Yes

I am having this just by installing Creeper Overhaul RP no leads or anything

Forgot to add, here is a resource pack with the files causing the issue
assets.zip

this is known and will be fixed soon