I've been having problems with one of the mash-up packs I bought from the store. The long sea grass in the Egyptian Mythology Mash-Up Pack is glitched for me on the Xbox One S and the animation flickers horribly. So I made myself an add-on to replace long sea grass with short sea grass.
I tried it out and it worked but whenever the add-on is active the horse and horse armour textures revert to default instead of the mash-up textures. There are no files relating to horses in the add-on at all. It happens on every single mash-up pack, but regular texture packs such as the candy, chroma hills and steampunk texture packs are fine.
Does anyone have any ideas on why this might be happening and what I could do to fix it? I have tested it on both the Xbox One S and a friends iPad and it does the same thing on both.