The Textures are not loading for players that do not use the Iris Shader Mod (from Modrinth)

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When i disable my Iris Mod, it shows only the black and purple "missing textures" image.

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Client Log:

Failed to load model minecraft:models/item/magma_cream.json
net.minecraft.class_151: Non [a-z0-9/._-] character in path of location: worldseed:mobs/chests/fairbg3.bbmodel/hit/VERH2

Bbmodel to reproduce:
https://hastebin.skyra.pw/linoferoye.prolog (put the content into the "fairbg3.bbmodel")

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bump

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it look like its working when i rename the bones in the models with lowercase characters only. But would be amazing if its fixed in the code so bones automatically generate as lowercase