Horses appear to be loading the old horse model, causing custom models to no longer load, and some resource packs to not load the horse textures.
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I mean, I like, and honestly PREFER, the old horse model as it's more detailed and just all around looks better compared to the old one, but the fact that custom models can't be loaded to overwrite it really bugs me. I was actually going to be making a racing addon using the horse, and was going to modify the model to give it some armor and whatnot that required extra 3D geometry, but low and behold this bug somehow crops up. If anything I hope that it's fixed before 1.12 launches (and somewhat hope the old model replaces the new crappy one)
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Applying packs in a world (or in global) that doesn't have min_engine_version set in 1.8.0 or higher will revert horses to use the old textures and models, but not just the horses, it also reverts zombified piglins back to zombie pigmen. I think it's just the same issue as MCPE-65496
It might be using the old model possibly hidden in the files.